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Old 11-22-2010, 06:07 AM   #1 (permalink)
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1985 Chevy 5 Speed Conversion Help

I bought an 85 Chevy Short Box 1/2 Ton with a four speed and would like to convert it to a 5 speed. I'm rather new to the 4x4 scene as all my cars sit less than 3 inches from the ground so I'm looking for some help.
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Old 11-22-2010, 08:42 AM   #2 (permalink)
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swap to a 3 speed auto, your tranny is a 700r4, swapping to the sm465 manual tranny would be more of a pain than i think you probably want to dig into. th350 or th400 would be easier and probably smarter
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Old 11-22-2010, 08:49 AM   #3 (permalink)
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swap to a 3 speed auto, your tranny is a 700r4, swapping to the sm465 manual tranny would be more of a pain than i think you probably want to dig into. th350 or th400 would be easier and probably smarter
Did you miss the part where he said 5 speed, not 4 speed?

To the OP, there is tons of info on that swap on here if you just search around a bit, the swap has been done multiple times.
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Old 11-22-2010, 10:31 AM   #4 (permalink)
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You are kinda limited to 5 speed options, your best bet is to find a NV4500 out of a GM truck. But since its a different transmission, you have to find the correct adapters to your transfer case, and will have to address driveshaft lengthening and shorting issues for starters.
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Old 11-22-2010, 11:06 AM   #5 (permalink)
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Originally Posted by dschack View Post
swap to a 3 speed auto, your tranny is a 700r4, swapping to the sm465 manual tranny would be more of a pain than i think you probably want to dig into. th350 or th400 would be easier and probably smarter
I've never seen such a misunderstanding of a question. You went the exact opposite way of what he asked for help on. Maybe read a little slower next time. OP, Like also stated, the NV4500 is your best and strongest bet.
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Old 11-22-2010, 11:11 AM   #6 (permalink)
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You are kinda limited to 5 speed options, your best bet is to find a NV4500 out of a GM truck. But since its a different transmission, you have to find the correct adapters to your transfer case, and will have to address driveshaft lengthening and shorting issues for starters.
why would you have "shorting starter" issues?
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Old 11-22-2010, 12:14 PM   #7 (permalink)
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why would you have "shorting starter" issues?
For real???????????


RE-READ my post. I was talking about lenthening and shortening the existing driveshafts. Not talking about shorting starters.....for fucks sake.
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Old 11-22-2010, 12:29 PM   #8 (permalink)
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I bought an 85 Chevy Short Box 1/2 Ton with a four speed and would like to convert it to a 5 speed. I'm rather new to the 4x4 scene as all my cars sit less than 3 inches from the ground so I'm looking for some help.
Well first off it would be helpful if you would tell us what kind of 4 speed ?? A sm465 manual or a 700r4 ??
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swap to a 3 speed auto, your tranny is a 700r4, swapping to the sm465 manual tranny would be more of a pain than i think you probably want to dig into. th350 or th400 would be easier and probably smarter
And Omg seriously did u read the same post as everyone else ????? Where the Hell did u get swapping in a 3 speed auto would be the correct answer for his question ? Wow the retardedness on here is sometimes shocking !!
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Old 11-22-2010, 12:30 PM   #9 (permalink)
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why would you have "shorting starter" issues?
I hope ur joking lol
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Old 11-22-2010, 12:32 PM   #10 (permalink)
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Awww...give the newb a break. He just joined yesterday, didn't realize that its Monday, not Tuesday, and his reading comprehension hasn't fully made its way past 1st grade yet.
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Old 11-22-2010, 12:40 PM   #11 (permalink)
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Awww...give the newb a break. He just joined yesterday, didn't realize that its Monday, not Tuesday, and his reading comprehension hasn't fully made its way past 1st grade yet.
It's shocking that this many automotive enthusiasts have such bad reading comprehension,grammar skills,and common sense ....not blaming it all on this above mentioned newb but on most of the other retarded newbs we have been seeing lately on pirate .....for fucks sake people go back to elementary school !!
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Old 11-22-2010, 02:13 PM   #12 (permalink)
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For real???????????


RE-READ my post. I was talking about lenthening and shorting the existing driveshafts. Not talking about shorting starters.....for fucks sake.
I think the word you're looking for is "shortening." There is a difference between shorting and shortening.
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Old 11-22-2010, 02:43 PM   #13 (permalink)
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Damn you man!

Fixed it. Happy now?
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Old 11-22-2010, 04:52 PM   #14 (permalink)
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I asked a simple question to the statement that I read in the way that I read it. My bad, I just reread it, it totally makes sense (now), but the jokes on me for not reading it right.


Buy the way It's not a big deal at all to put a 4500 in a earlier (solid axle trucks). I put it in my k30 and took it out and it's now in my dodge.

BTW I still have the bellhousing for a 4500 to early Chevy with push rod clutch.

And because you have to redo the driveshafts should not be a reason not to do a swap. Driveshafts are not that big of a deal.

-Junk yard the front (Stupid Duty has 1350 CV, slip yoke with 1350 at the axle)
-and pretty much everything comes with 1350 rear, just get a longer than you need take to driveshaft shop and have them shorten(I had to) and balance it.
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Old 11-23-2010, 11:28 PM   #15 (permalink)
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Sorry guys...and thanks for the help in advance. Currently the truck is a manual 4 speed which I assume is the sm465? From what I am reading I would like to put the NV4500 in the truck...which a guy at my local junk yard wants to trade for a 348 that I have. Hopefully it's a good transmission and worth the boat anchor 348 in my yard. What adapter plates do I need? The driveshaft lengthening/shortening is not really a problem. And the truck has a hydraulic clutch if that makes any difference?
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Old 11-23-2010, 11:40 PM   #16 (permalink)
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Originally Posted by seddelman View Post
Sorry guys...and thanks for the help in advance. Currently the truck is a manual 4 speed which I assume is the sm465? From what I am reading I would like to put the NV4500 in the truck...which a guy at my local junk yard wants to trade for a 348 that I have. Hopefully it's a good transmission and worth the boat anchor 348 in my yard. What adapter plates do I need? The driveshaft lengthening/shortening is not really a problem. And the truck has a hydraulic clutch if that makes any difference?
its a stout tranney. trade for it. unless you figure that 348 is worth more than 500-800
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Old 11-24-2010, 08:50 AM   #17 (permalink)
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Originally Posted by seddelman View Post
Sorry guys...and thanks for the help in advance. Currently the truck is a manual 4 speed which I assume is the sm465? From what I am reading I would like to put the NV4500 in the truck...which a guy at my local junk yard wants to trade for a 348 that I have. Hopefully it's a good transmission and worth the boat anchor 348 in my yard. What adapter plates do I need? The driveshaft lengthening/shortening is not really a problem. And the truck has a hydraulic clutch if that makes any difference?
Are you talking about a 348 W block GM motor? Probably not as popular as the 409, but probably worth a fair amount to someone doing a factory resto on their late 50s/early 60s car.
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Old 11-25-2010, 10:05 AM   #18 (permalink)
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why would you have "shorting starter" issues?
You made my day. Thanks.
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Old 11-25-2010, 11:35 AM   #19 (permalink)
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shortening.... lard...

mmmm.... gravy.
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Old 11-25-2010, 07:26 PM   #20 (permalink)
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why would you have "shorting starter" issues?
Ive had a few today...and that's some funny stuff!
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Old 11-25-2010, 09:41 PM   #21 (permalink)
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Sorry guys...and thanks for the help in advance. Currently the truck is a manual 4 speed which I assume is the sm465? From what I am reading I would like to put the NV4500 in the truck...which a guy at my local junk yard wants to trade for a 348 that I have. Hopefully it's a good transmission and worth the boat anchor 348 in my yard. What adapter plates do I need? The driveshaft lengthening/shortening is not really a problem. And the truck has a hydraulic clutch if that makes any difference?
As long a the trans has the bell housing and is a 4wd trans you might not need much.

I did a 700r4 to 4500 swap in my k5 and all I had to do was an input swap on my t-case, find a pedal assembly, get a factory master cylinder and a cluth kit. I ran the stock drive lines and the cross member even bolted up in the same holes on the frame.
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