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Discussion Starter #1 (Edited)
Good morning all

My name is Lee Smith & I live near Fort Dodge Iowa.
I am a retired Iowa farmer- cattle feeder. Age 65 - a old man to most of you.

I have been fooling with the 280Z & ZX cars for 4 years.

I have joined your forum because I bought the wife a winter car yesterday.
A 94 GMC S15 4X4 that may have a weak AT.

I know next to nothing about 4x4s & nothing about the S10s.

I am trying to find out what years are the same.
What years engines, transfer cases & trans will interchange.

Any help will be appreciated.

Lee Smith
 
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Lee Smith said:

A 94 GMC S15 4X4 that may have a weak AT.

I know next to nothing about 4x4s & nothing about the S10s.

I am trying to find out what years are the same.
What years engines, transfer cases & trans will interchange.
welcome Lee,

being a '94 makes it difficult to determine 100% what trans you have, at least in my mind, as '94 was the first year for the new body style of the S-Series pickups. My initial guess is that is has a 4L60E transmission in it, nowever I know someone with a '95 Blazer and they have a TH700R4 in their truck, so I dont want to give you false information. I suppose one of 2 ways is to take a look at the RPO code plate inside the glovebox, however im not exactly sure what 3 digit code either transmission is.

You can physically look at the transmissions and tell also.

the 4L60E shown here (notice the ribs on the case)


the TH700R4/4L60 (non-electronic) shown here

hope thats a little helpful, perhaps someone else can jump in and help me out.

As far as engines, your limited to anything 1995 and earlier. 1996 and newer engines have different style cylinder heads which is going to make things a nightmare if you do attempt to put one in.

Transfercases I dont really know anything about, however there should be a metal tag on it somewhere with some numbers stamped in it. One of those will be the model number of the t-case.
 
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oh, one more thing, the 4x4 transmissions are completely different from the 2WD transmissions, so dont let anyone sell you one from a Camaro or something telling you its the same trans, its not.
 
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Discussion Starter #5
Thanks for the info, it is a start.
A neighbor has talked about the older trucks with C 3, C 4 & 350s on SBC.
The bell looks close to what I have seen. ??

Will the older 3-spd bolt to the 4.3L?
I have 1 on hand & been told that it ia a C4.
I also have a older 350 SBC & AT setting in my shop, that is good.
,
Thanks again

Lee
 
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Lee Smith said:
Thanks for the info, it is a start.
A neighbor has talked about the older trucks with C 3, C 4 & 350s on SBC.
The bell looks close to what I have seen. ??

Will the older 3-spd bolt to the 4.3L?
I have 1 on hand & been told that it ia a C4.
I also have a older 350 SBC & AT setting in my shop, that is good.
,
Thanks again

Lee
ok, you lost me, I have no idea what you mean by C3 or C4. The only thing that comes to mind is a Ford transmission, but even still I have never heard of a C3, only C4 & C6.

Will an older style TH350 work in place of your current trans? That all depends on what your current transmission is.
First of all, why would you want to go to a 3-speed over a 4-speed trans?
This is just a winter vehicle correct?
Why spend all the time and money converting it?
Also, if your current trans is a 4L60E, then the swap is going to be highly involved, requiring you to reconfigure some of the computer system in the truck being that the 4L60E is entirely computer controlled, not hydraulic like the older style transmissions.

Why not save yourself a few thousand hours and a few hundred dollars and just buy a "known good" replacement trans of whats currently in there or have the current one rebuilt?
 
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Discussion Starter #7
I don't know what he was talking about ether.
He said that the C4 was a very strong transmission.
That they usually come in the ton trucks & I have 1 on hand.
A 80 GMC 35 with a 350 engine & AT. A rust bucket, but good drive train.

I was asking if it would bolt to the 4.3L engine.

I didn't know that the 4L60E was entirely computer controlled so
that won't be a option.

I was trying to find out if what I have on hand will work.
It doesn't sound like it will.

Thanks for the info.
 
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