heavy 1/2 or camper special

[white_lexie]

Im not sure they used to be called but today they are called 1500hd. I bought a 94 sierra parts truck that came equipped with a 14 bolt rearend in what I think is a 410 ratio. I am in the process of swapping the rearend, front diff, trans and transfer case as well as various other interior parts. Can someone give me a definite answer as to what these trucks were called and what all gear ratios that they came in. I was also wondering what ratio my yukon came equipped with as it didnt have a tow package and it is a 2 door gt if that matters any?

 

[SunlitComet]

Suvs came with 3.42 or 3.73. The 1500 bodies were the same base truck, but just had say stronger axles or extra cooling capacity or maybe even a stronger tranny. Those would have been like 3.42, 3.73 or 4.10. The last two listed were likely installed. The rpo code sticker in the glove box panel will have 3 digit codes. Look for any that starts with the letter G.

 

[kcb37]

What stated above.
Don't believe any came with a 4L80 though, should all be 4L60's in the 1/2 tons.
The brakes could be had bigger, axle a 14bt sf, bigger cooling, secondary trans cooler, think an extra leaf in the rear pack.

Even now a 1500HD depends on the year your talking about. GM did make one (a real one) that was an 8 lug, in the 90 body style they made a light 3/4 that was a 6 lug. Really a heavy half. Should have been the other way around.

GQ1 -- AXLE REAR, STD RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)

HC4 -- AXLE REAR, 4.56 RATIO

 

[white_lexie]

http://www.gm-trucks.com/rpo-code-lookup/ only keeps info back to 2001 and I do not have the truck anymore. I guess I will pull the cover and take a look.

 

[kcb37]

RPO codes are in the glove box.

 

[Y2KpewterZ]

Buddy had a 98 Z71 heavy half ton. Had t 4l80e

 

[white_lexie]

Lets say that it did have a 4l80e is is going to bolt up and plug in the same as mine?

 

[Dowsewashere]

Nope. These trucks were labeled 2500s but had six lug axles. It from what i understand means that is has a 14bolt semi floating rear end. Either the 4l60e with a trans cooler or a 4l80e and 3/4 ton leafs.

If it had a 4l80e there are a slue of parts needed to swap a 4l80e into a truck with only a 60. Things like bell housing and stuff.

 

[white_lexie]

Ok no problem I think it has the 60 anyway so I dont think there should be a problem.