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swapping trannies in 72 Chevy
#18773 Thu Aug 15 2002 08:44 PM
Joined: May 2000
Posts: 52
D
dubie Offline OP
Member
I wnat to get rid of the original 3 speed column shift and install a 5spd form a late 80's full size Chevy 1500. Has anyoe done this, or can lend some help?

Re: swapping trannies in 72 Chevy
#18774 Thu Aug 15 2002 10:57 PM
Joined: May 2000
Posts: 235
Shop Shark
Hard to change the tranny without considering the rest of the driveline...

I don't have any specific knowledge (i.e. is it a direct bolt on). But you might be better off with a 4-spd from the 70's era - it will be better matched to the engine, and easier to install. Cheaper too, unless you already have one of them 5-speeds. Maybe still cheaper, if special adapter plates are required.

The top gear is going to be 1:1 for all trannys, unless there's an overdrive involved. So no change in top speed, just more shifts from 0 to 60. You'll have great torque (and much stronger leg and arm muscles) but no real drivability benefit.

If you were going to swap out the rear end for a higher gearing at the same time, then it makes more sense to go for the 5-speed. You'd get higher top speed, and similar power for the lower gears.

Otherwise the 4-speed is a better swap, and can probably be done in a weekend or three.

You will likely have to lengthen or shorten the driveshaft for any swap. Drive shaft shops can do this, probably $150 or so.

-Boyo


'48 Willys CJ-2A / '55.1 Chevy 3600 / '66 Austin-Healey 3000 / '04 Volvo wagon (parenthood!?)
Re: swapping trannies in 72 Chevy
#18775 Fri Aug 16 2002 12:07 AM
Joined: Dec 2000
Posts: 54
L
Wrench Fetcher
I think the tranny you're looking for is the NV 4500 out of 3/4, 1 tons and some 1/2's ? Or maybe the NV 3500? only found in 1/2 tons. I put a NV 4500 in my '76 if you need details drop me an email. wink

Re: swapping trannies in 72 Chevy
#18776 Wed Aug 28 2002 07:13 PM
Joined: May 2000
Posts: 52
D
dubie Offline OP
Member
I know I can get a 4 spd from a 67 C/10 for $200. All that is really involved in the swap is the driveshaft, cross member, and cutting for the high hump. I have a feeling that will be the way to go.

Re: swapping trannies in 72 Chevy
#18777 Thu Aug 29 2002 03:21 AM
Joined: Apr 2000
Posts: 58
J
Member
Don't know about the 67's but the 66's didn't have a tranny mount crossmember. The rear mount was on the bell housing.

Re: swapping trannies in 72 Chevy
#18778 Thu Aug 29 2002 07:30 AM
Joined: Jun 2001
Posts: 85
B
Wrench Fetcher
If it's an unmolested '67 it'll be a Synchro Mesh 420, if out of a '68 or later it's the SM465. I believe the transitional gearing is different -- the earlier tranny starting out even lower. Both are 1:1 in 4th, of course. Jeep and Toyota guys seem to think Muncie 420s are neater than sliced bread; I think it's a fit thing. The 465 is slightly longer, and if you have a '72, maybe you should look for a '68 or later SM465 if you want easy bolt-up capability. I know a '72 465 fit on my truck ['68] like it was made for it.


Every 25 years I like to rebuild that 292 just for GP
Re: swapping trannies in 72 Chevy
#18779 Thu Aug 29 2002 07:03 PM
Joined: May 2000
Posts: 52
D
dubie Offline OP
Member
This is an SM465 tranny. Found out yesterday that only the cab was from a 67, the rest of the truck is a 69. I believe this tranny has the granny low gear to it???

Re: swapping trannies in 72 Chevy
#18780 Thu Aug 29 2002 09:43 PM
Joined: Jun 2000
Posts: 2,773
F
Shop Shark
If it's a sm465, it's a 4 speed granny box, with reverse to the right and down. Iirc, the change was made in 67.


Fred
52 3600
69 C-10

Moderated by  Woogeroo 

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