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Old 02-08-2011, 09:46 AM   #1 (permalink)
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1984 Chevy 3/4 ton 4x4??????

Have a question that hopefully somebody here will know the answer to. Truck is a 1984 Chevy 3/4 Ton 4x4 that origionally had a Diesel engine in it, it has a 14 bolt rear axle and a 10 bolt dana 44 front axle with manual lockouts and what appears to be a NP205 transfer case. My question is being this was origionally a diesel truck what Axle Gear Ratio would it likely have???

Last edited by taker; 02-08-2011 at 03:42 PM. Reason: correction to the year of the vehicle
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Old 02-08-2011, 10:01 AM   #2 (permalink)
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jack it up spin the driveshafts and find out for yourself...
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Old 02-08-2011, 10:04 AM   #3 (permalink)
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Well its out in the middle of a field and we currently have 20" of snow on the ground...So thats much easier said than done. But yes that would be the sure way to know but I was hopeful that someone has been here before and would have an idea!!
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Old 02-08-2011, 10:32 AM   #4 (permalink)
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Well ever truck is different so you wont know until you check, ya never know if somone changed the gears or what the factory stuffed in there. But i bought a parts truck that was a 83 diesle 3/4 ton with a 14b ff rear and 10b front and it had 4.10s. Doesnt mean yours has it but just thought id let ya know what iv seen.
My truck is a 83 diesle 1/2 ton and with the stock 1/2 ton axles it had 3.42s.
My buddys 76 long bed 1/2 ton has 3.73s.
So i dont know if chevy put 4.00:1 ratios and higher in 3/4-1 ton trucks or what. maybe somone knows. But i dont
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Old 02-08-2011, 11:01 AM   #5 (permalink)
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Well its out in the middle of a field and we currently have 20" of snow on the ground...So thats much easier said than done. But yes that would be the sure way to know but I was hopeful that someone has been here before and would have an idea!!
Get to digging.Maybe the axle tag is still bolted to the diffcover.This would tell you.
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Old 02-08-2011, 11:14 AM   #6 (permalink)
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Can't say I am aware of a factory diesel offered in that year and model........but it really shouldn't matter for the gears. I've seen 3.73, 4.10, and a rare 4.56 in older 3/4 tons.
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Old 02-08-2011, 11:39 AM   #7 (permalink)
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Ok well I took a little drive out to the truck again to further investigate the situation, so far I have been unable to determine the gear ratio as the tag is no longer bolted to the diff cover. However I have learned that it is actually a 1984 and came equipped with a 6.2Liter diesel and a 4 speed transmission from the factory. I have determined for sure the rear axle is a 14b however the front has me a bit stumped but I took some pics so im gonna get those off the camera and do some research to determine what axle this actually has in the front. And side note whats this built in canada stuff all about as thats what the door tag says??????
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Old 02-08-2011, 12:06 PM   #8 (permalink)
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Here are a few of the pics I took, I believe the front axle is a corporate 8.5" 10 bolt??? The rear is a 14b, and I have a pic of the transfer case perhaps someone could identify that for me as well.. Sorry for the noob questions but I just want to be sure on this stuff!!

Front



Rear


Transfer Case
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Old 02-08-2011, 12:09 PM   #9 (permalink)
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Based on the blocks in the leaf springs is this some type of aftermarket lift or was that a stock setup??
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Old 02-08-2011, 12:31 PM   #10 (permalink)
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Your correct on the axles. T-case looks like a np208 to me, clean off the very back of it, where the little red circle tag is with an ID on it. It will tell you for sure.

I dont like the look of those blocks in the front though.

Kinda hard to tell from the pics, but there may or may not be a little ID tag also on the diff cover bolts that will give you the gear ratios. If not, just pull the cover, and check the ring gear. It will have the gear ratio stamped into it for sure.
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Old 02-08-2011, 12:34 PM   #11 (permalink)
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Thats a np208 transfer case, the tag on the back thats coverd in dirt will tell you that. looks like a Dana 44 in front but im not sure. rear is corprate 14bolt. my buddy has a 84 6.2 it had 3.73's under it. thats the most common for them.
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Old 02-08-2011, 12:50 PM   #12 (permalink)
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Yep, looks like a 10bolt front with 14bff rear and has a th400/np208 for tranny and tcase. Looks like it has 4" lift springs on the front and someone added a small lift block under it.

Maybe a long shot but check the glove box for the axle ratio codes.
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Old 02-08-2011, 12:59 PM   #13 (permalink)
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Yeah the tag with the axle ratio's was under the hood but it was badly damaged and unlegible. So tell me about this 208 transfer case is that good or bad or ugly??????
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Old 02-08-2011, 01:19 PM   #14 (permalink)
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does someone need to come do the dirty work for u as well ? hate to see u spend 20 minutes and answer your own questions
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Old 02-08-2011, 01:43 PM   #15 (permalink)
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Oh god man your so funny, thank you so much for your insight and near genius input. I have already posted on this forum 12 times. What took you so long. Anyway didnt realize I had posted somewhere that I wanted comments from the peanut gallery but again thanks for your insightful knowledge. I came to this forum to get some help on things I dont know but what I do know now since starting this thread is this.

1) I have a 10 bolt front axle
2) I have a 208 Transfer case
3) badboy64 is a complete DOUCHE BAG
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Old 02-08-2011, 01:54 PM   #16 (permalink)
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Be aware front lift blocks is NG. I know its just sitting in a field right now but if you build that thing they gotta go.

You could have anywhere from 3.42s to 4.56s (unlikely) but more than likel 3.73s or 4.10s. Again you'll never know for sure until you pop the cover.
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Old 02-08-2011, 01:54 PM   #17 (permalink)
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In on page #1

This is PIRATE 4x4. Prepare to wear your flame proof panties when you hit these parts. NOOB questions go in the NOOB section...or just prepare to get flamed a bit. Just tellin ya how it is...no biggie.

20 second google search provides this..

NP208 low range is 2.72:1, and it weighs about 70 lbs, but yours will have a slip yoke rear DS, which kind of sucks. Nobody makes a SYE kit, but you can use the back half of a Dodge NP208 to convert it to a fixed yoke.
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Old 02-08-2011, 01:58 PM   #18 (permalink)
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Here is what my 2 minute google search declared for gear ratio

When in Two Wheel Drive, the NP208 does not turn the front driveshaft. The NP208 has a high range of 1.00:1 and a low range of 2.61:1 The front axle uses either manual or automatic locking hubs in combination with the NP208.


So see not all google searches are deffinitive by any means which is why coming to a place that is dedicated to the subject was origionally thought to be a better idea. Of coarse this was before I realized the douche bag population was so great.. upon further thread searching and reading I can clearly see this place is a magnet for the jackasses abroad lol. I can run with the best of em no worries here!!!
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Old 02-08-2011, 02:00 PM   #19 (permalink)
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edit... a minute too late with my $.02

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Old 02-08-2011, 02:06 PM   #20 (permalink)
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I believe someone did some swapping.I didn't think the 208 was put in a chevy until like 81.
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Old 02-08-2011, 02:07 PM   #21 (permalink)
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Looking at the 1978 Chevy Truck brochure...a 6.2 diesel was not avail in the US models...maybe in Canuk-istan if your truck indeed came from there. The only Diesel listed for 1978 was the shit-tastic 5.7 that was installed on the 2wd 1500's.

States that 3.73 4.10 or 4.56 were avail...as previously mentioned.

1982 first year for 6.2 diesel...so someone is blowing smoke up ur ass on the diesel engine stock thingy..
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Old 02-08-2011, 02:09 PM   #22 (permalink)
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Here is what my 2 minute google search declared for gear ratio

When in Two Wheel Drive, the NP208 does not turn the front driveshaft. The NP208 has a high range of 1.00:1 and a low range of 2.61:1 The front axle uses either manual or automatic locking hubs in combination with the NP208.


So see not all google searches are definitive by any means which is why coming to a place that is dedicated to the subject was originally thought to be a better idea. Of coarse this was before I realized the douche bag population was so great.. upon further thread searching and reading I can clearly see this place is a magnet for the jackasses abroad lol. I can run with the best of em no worries here!!!
You've been a member for FOUR FRICKING years and you JUST figured out that you will get flamed! LOL ha ha ha ha Carry on!

Careful...these same people you are referring to as DOUCHE bags...are answering your silly ass questions.
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Old 02-08-2011, 02:09 PM   #23 (permalink)
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Looking at the 1978 Chevy Truck brochure...a 6.2 diesel was not avail in the US models...maybe in Canuk-istan if your truck indeed came from there. The only Diesel listed for 1978 was the shit-tastic 5.7 that was installed on the 2wd 1500's.

States that 3.73 4.10 or 4.56 were avail...as previously mentioned.

1982 first year for 6.2 diesel...so someone is blowing smoke up ur ass on the diesel engine stock thingy..
Well that fits with the 208 no being put in until later.My guess would be the drivetrain is a swap.
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Old 02-08-2011, 02:22 PM   #24 (permalink)
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so someone swapped out the 350 or 400 that was in there to put in a 6.2 POS, and then found out it really WAS a POS and swapped a SBC back in it...and now you want to buy it. humm.

You need to look in the glove box and get the coses off the sticker...if it is still there and look to see how the truck was built.

You could have had a 292, 350 or 400. Bigblock was only avail in the 2wd that year...
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Old 02-08-2011, 02:22 PM   #25 (permalink)
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with a 6.2 a 208 and a ten bolt its not a swap, ether somone put a diff front clip on it (73-80) or this guy cant tell the diff between the four squair head lights and tow round.
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