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Discussion Starter · #1 ·
Hello,
I have a 1969 M715 for which I'm building an Olds 455. I plan on driving the truck as a semi daily driver but don't think the engine is going to like the 5.88 gears. I was thinking of regearing to 4.56, but I don't want to lose my crawl ratio. I've been going through the archives and it seems that there are several overdrive units, such as the AA Ranger or the Warn overdrive. Will these work with a T-98/NP200 combo? Any other alternatives? Is a 4:1 gear set available for NP205's?
Thanks.
Mikel
 

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you can build a dana 20 with dana 18 guts and get an Advanced Adapters kit to make it a divorced t-case like your np200.
you'd end up with a 2.46-ish low. then you can drop your gear ratio to 4.56 and not loose much in the way of crawl ratio. I'd question the durability of anything less than an NP20x series tcase or an atlas in that thing. seach in here on "O'brien gears" I think he was working on a 3:1 gear set for a np205, but not sure if it was ever done, but it'll co$t.
 

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Swap to a divorced Dodge NP205, keep waiting for the low-range gears.

You have two easy choices for the overdrive...

Option 1.) Run a Ranger Overdrive torque splitter between the engine and trans and shorten your intermediate shaft (may have to move the t-case back) or swtich to a married mount 205, which would mean ditch the T-98 in favor of a SM465.

Option 2.) Run the Gear Vendors unit between the trans and t-case (probably have to move the divoced case back) or run the OD behind the t-case, eliminating OD in 4wd, doesn't sound like that big of a deal, but it might be nice if they ever make the 3:1 gears to be able to split that with the OD to a 2.25:1 for wheel speed stuff, of course with a 455 wheelspeed in high range won't be a problem.

Most importantly......PICS!!!

(member of the "I get a boner for M-715's club")
 

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Discussion Starter · #5 ·
Thank you guys. I think I'll (attempt to) regear to 4.56 and hope a 3:1 or 4:1 gear set becomes available for the 205.
:)
 

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4Bangler said:
Swap to a divorced Dodge NP205, keep waiting for the low-range gears.

You have two easy choices for the overdrive...

Option 1.) Run a Ranger Overdrive torque splitter between the engine and trans and shorten your intermediate shaft (may have to move the t-case back) or swtich to a married mount 205, which would mean ditch the T-98 in favor of a SM465.

Option 2.) Run the Gear Vendors unit between the trans and t-case (probably have to move the divoced case back) or run the OD behind the t-case, eliminating OD in 4wd, doesn't sound like that big of a deal, but it might be nice if they ever make the 3:1 gears to be able to split that with the OD to a 2.25:1 for wheel speed stuff, of course with a 455 wheelspeed in high range won't be a problem.

Most importantly......PICS!!!

(member of the "I get a boner for M-715's club")
The gear vendors OD doesn't work at low speeds. I have one behind the t-case in an '85 Chevy, and it won't shift unless you're going >30 MPH, and even then there's a delay of about 3 seconds from when you pull the switch to when it actually shifts. The delay gets shorter the faster you go until you get to about 60+ where it's almost instantanious. Since he could mount it between the tranny and t-case, he could cut those speeds in half in low range, but it's not like a ranger or warn, where you can actually start out in OD. I'm not saying it won't work, just wanted to let you know what they're like before you sink a bunch of money into one.
 

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man,if i were thinking about dumping some serious $$ on regearing i would figure out a way to come up with some more $$ and go nv4500. keep the 5.88's!!! find a way around em like 44's:D .
 

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I was going to do an NV4500 in my Chevy, but the Gear vendors OD was a lot cheaper, and I got 7 useable gears in 2WD. It has a couple disadvantages I mentioned though. Overall, I think it's great.
 

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I gotta brag...
I have a '67 WEPS and we stripped it down to the frame rails. Then I took a 454, punched it 468. SM465 and doubled 205's.
Split shift the second xfer then put a D60 front (open knuckle) up front and a Corp 14 with dics in the rear.
Bobbed the ass end by 16" so it could fit in the garage.
Put an 8" (?) Chevy Skyjacker lift on it.
I screwed up while fabbing up the mounts and now have the engine to far forward and am having to run the NEW stock radiator with the dual Black Maxes as pushers.

Sorry, I just had to brag a little..
 

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Discussion Starter · #14 ·
highvolt said:

I have a '67 WEPS and we stripped it down to the frame rails.
Oh, I thought there such a thing as a 67 WEPS. I should get some sleep :)
 
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