1986 C10 Trans Tunnel 4-Speed?

[aotte1]

New member, ride is 1986, Chevy C10, sbss with 4-speed (New Process 3 speed w/OD). My question is related to replacing the cab as being less expensive, then repairing cab corners, possible front window channel damage from rust . There is also a little damage to drivers floor pan from cowl water leakage, soaked up by the thick floor mat underlayment ( sponge like). Other wise very little rust, rockers good.

Question, is the trans tunnel on these later cabs like 1986, universal for all available trans both 2 and 4 wheel drive. A picture of mine is attached. Review of previous answers to similar question seemed to say trans tunnels were all the same in later years for this style truck. However, not absolutely sure that is what answer was, so, asking again to be sure.

This is a very original barn find truck, not driven for many years, red/red, custom deluxe, 108 K miles, original paint, wood floor, rally wheels and a few other options. Built in Canada. More info on this truck as I study it. Plan to restore since very little rust on truck except for cab corners.










































































































































































































































































































































































































































































Glad to be a member, have researched questions here for a while.

[79Betty]

It should be a bolt on style if i remember right. My 77 and 78 and 79 all were interchangeable as they were all 4 speeds or 4x4's.

[superwade57]

2wd manual trucks and 4x4 trucks had a high hump floor 2wd auto had a low hump. The high humps bolted in except the the latest years they are high still but molded in.

[aotte1]

thanks for the reply, my tunnel is not a bolt-in (did not make that clear in first post). I only know what I read here- no experience yet. Answers that I readed say that some time in the mid 80's GM went away from the bolt in trans tunnel covers for the 4x4 and 4 speeds and went to molding them as all one piece ??? Does my pic of tunnel shape ( non-bolt in) look like the bolt-in 4x4/4 speed one. Again little experience, however, seems to have same shape from pics reviewed here of bolt-in covers.
thanks again for reply,
Les

[superwade57]

Its really really similar.. almlost looks a tiny hair taller and more squared off from what I've seen I'd guess 86 or 85 is when they stopped bolting them in. Bolt ins are really Nice for accesability. Bot gotta take the carpet out for that . And to clearify all manual tranny 3 and 4 spd 2wd and 4x4 were high hump. And if you get an auto 2wd and wanna swap in a manual you will need to graft In a high hump

[aotte1]

SuperWade,

To confirm GM in 86' made two different cab floor pans one for 2-wd automatics, and another for 4x4s and 2-wd stds. Does my pic look like the high hump? My truck is 1986 2 wheel drive w/4 speed trans (New Process).

FYI, the shifter was made by Hurst for GM I am told.

thanks for the information,
Les

[superwade57]

All years they made two floors In this bodystyle. And yes yours is high hump

[KrazyRay]

83 was the last year of the bolt in high hump. There were 2 different types of bolt in high humps. The 4wd hump has the hump profile go all the way back. The 2wd manual transmission contours back down at the rear of the hump. Also, the 73-80 humps are different than the 81-83. Not long ago, I had all 4 square body bolt in humps to compare.

[Keith Seymore]

Welcome; excellent transmission.

My truck is an '87 with the A-833 trans. If you go to my build/intro thread (linked below) you will find hundreds of pictures showing the truck in various states of dissassembly and reassembly. It is a (non-removeable, not bolted in) high hump floor.

You are correct. Shifter was made by Hurst. My truck was placed on "stop order" during the period of time when Hurst was being bought out by Mr Gasket Co, and then built from the reserve of transmissions available at the Flint assembly plant. I'm not sure if Mr Gasket ever picked up the part and continued to manufacture it after the transition.

Again, welcome!

K

[aotte1]

Keith,

Very nice 87', do you have an idea how much HP/Torque the A-833 trans can handle? It would be in the 86' SBSS which is pretty light along with more gear then the stock 3.08 ( which should put less load on it) A transmission 4-speed rebuild person told me around 400HP. Are their any recommended upgrades for this transmission.

Also, any idea how common the A-833 transmission option is?

thanks,
Les

[Keith Seymore]

Originally Posted by aotte1

Keith,

Very nice 87', do you have an idea how much HP/Torque the A-833 trans can handle? It would be in the 86' SBSS which is pretty light along with more gear then the stock 3.08 ( which should put less load on it) A transmission 4-speed rebuild person told me around 400HP. Are their any recommended upgrades for this transmission.

Also, any idea how common the A-833 transmission option is?

thanks,
Les

Here's a very good link that might offer more insights:

http://www.customclassictrucks.com/t..._transmission/

I haven't read it in a while so I don't recall if it covers upgrades or HP levels. It's a MOPAR trans but I don't think they put it behind there biggest and baddest engines.

It's one of the rarer options during the C/K/R/V period. I know we built a quantity of 100 1987 model year trucks with my temporary deviation; I can't say if they came back later in the model year and built more trucks after the fact.

K

[aotte1]

Keith,

Thanks for the reference, will check with local Chrysler trans guys to see what they say also. The truck has the original V-6 in it now. Thinking of replacing with a 305/350 original style looking engine. Maybe an 880 (later 90s) or little M block for something around 400 CIs for more torque and easy to drive.

I also have older iron, a NHRA C/SA 1970 Buick that I am continuing to make faster.

Will start a build-up page for the 86' along w/pics soon to document the original stuff on it. It may have the original shocks still on it, this truck is very original.