Comments on using a late model manual tranny?

[chevybill]

Hey guys, after extensive searching, I have finally sourced a late model 5 speed for my truck, the overdrive transmission out of a 92 full size truck.

Has anyone used this tranny, will it bolt to an old style 350 motor (pre 85 style)?

Cany anyone answer if I will have to change to a high hump for the tranny, instead of the low hump I have now?

And last, how about the yolk for the driveshaft?

Thanks for all the help.

[gr8scott51]

You may have to change the bell housing, but that's not a big deal. The high hump was more for the 4X4s and the granny 4 speeds. I didn't have to change for my T5 (not the same as yours I know). You'll have to build a custom driveshaft anyway, so the yoke will take care of itself. I just bought the driveshaft and tranny together from the same donor truck. Get a good measurement, take both driveshafts to a good driveline company and have them cut, weld AND balance your new shaft.

[Tx Firefighter]

No need to swap any bellhousing. The 92 model V8 and V6 engines and transmissions used the same pattern as the earlier GM engines did.

[gmc67swb]

Originally Posted by Tx Firefighter

No need to swap any bellhousing. The 92 model V8 and V6 engines and transmissions used the same pattern as the earlier GM engines did.

If i'm not mistaken the bellhousing is integrated. I had a '92 Chevy truck with a 5-spd. When I replaced the throw out bearing and had the tranny rebuilt, it all came out in one piece. He will have to figure out how to mount a clutch master cylinder in order to use the tranny as is. I could be wrong, but I think it's all one piece.

[4x4Poet]

I'm pretty sure that bellhousing info is correct. To retain the mech clutch, he'll need a bellhousing that mates the NV4500 and retains the mech clutch driver's side fork. Also confident AA offers such a bell housing. Of course, he can convert to a hydraulic clutch and then prolly use the '92's bellhousing.

[sneakysnake]

My 90'and 92' 4.3V6 both have intergrated bellhousings and hydro clutch.
and Ive had to replace both of them.
Flywheel to clutch mating and bell bolt pattern would be areas of concern.
mounting a hydro mastercylinder would not be that hard.
But Im not familiar with all manual trannys gmc makes, just these.

[Tx Firefighter]

I was speaking generally in response to Gr8scot51 about the bellhousing swap not being needed as all engine sizes in the 92 model truck (4.3, 305, 350, and 454) use the same engine to trans mounting pattern, which is also the same as Chevybill's earlier V8 uses.

[454_72_4X4]

NV4500 is for the 3/4 ton and 1 ton trucks and has a seperate bellhousing. Although it has a different bolt pattern than the "normal" chevy 4 speeds. AA does make a "manual" clutch linkage bellhousing for the NV4500 if you've got an extra $400-$450 laying around.

NV3500/3550/Getrag/MG5, (whatever you want to name it), is for the 1/2 ton and S-10 pickups. It has the integrated bellhousing. I haven't heard of a way to convert to the manual clutch linkage on these trans yet. and they only come with the electric speedo hookup, (2wd, 4x4 speedo hooks to the transfer case).

Also the full size 1/2 ton truck version uses a TH400 style yoke and has a 30% overdrive 5th gear.
The S-10 version uses a TH350 style yoke and has a 20% overdrive 5th gear.

[Willy Prost]

Did New Venture make a model 3550 also?

If so, that is not the same as the Tremec 3550. The Tremec 3550 aftermarket 5-speed does not have an integrated bellhousing. The Tremec bolts up to the truck bellhousing, it just needs a spacer ring to make up the difference between the 4.684 in throughout retainer diameter and the 68-72 truck bellhousing diameter of 5.125.

[gr8scott51]

Originally Posted by Willy Prost

The Tremec bolts up to the truck bellhousing, it just needs a spacer ring to make up the difference between the 4.684 in throughout retainer diameter and the 68-72 truck bellhousing diameter of 5.125.

This is where the difference is in the bellhousing. When you go to the junk yard or swapmeet, you can find bellhousings with both size openings, so you don't have to use an adapter. With my T5, I had to install a spacer anyway (or cut the input shaft).