The VIN decoder says my truck has a 4L70 transmission, that's not right is it?

[someotherguy]

Problem is, backing plates to put bigger brakes on the 10-bolt axle are tough to come by.

Wouldn't a 1500 Suburban rear be a good donor for this? They're JB6 by default AFAIK. And the rears themselves are usually toast from hauling the full weight of a Suburban around for all those miles.. brake goodies should be useful, though.

It seems my '92 C1500 extended cab longbed had the same setup. Big brakes out back. Truck already had plenty of owners and a ton of miles on it when I bought it back in '99 though so whether it was the original rear end is a tough call. I don't think I have the SPID label anywhere to refer to.

Richard

 

[HotWheelsBurban]

Wouldn't a 1500 Suburban rear be a good donor for this? They're JB6 by default AFAIK. And the rears themselves are usually toast from hauling the full weight of a Suburban around for all those miles.. brake goodies should be useful, though.

It seems my '92 C1500 extended cab longbed had the same setup. Big brakes out back. Truck already had plenty of owners and a ton of miles on it when I bought it back in '99 though so whether it was the original rear end is a tough call. I don't think I have the SPID label anywhere to refer to.

Richard

Eclb might've got the JB 6 on account of weight. But yeah, there are lots of C1500 Burbs in the yards with rear axle still in them, around here at least.

 

[Schurkey]

Yeah. It's not like they don't exist, but they're way less common than the smaller brakes.

I don't think the backing plates are available "new" any more, though.

 

[L31MaxExpress]

Eclb might've got the JB 6 on account of weight. But yeah, there are lots of C1500 Burbs in the yards with rear axle still in them, around here at least.

Should be some Express vans and maybe some Astros that have them too.

 

[haroldwca]

With respect to the OP's original question, it should be easy to tell which transmission you have. The decoder says 4L70"E" (emphasis added on the "E"). If you have the 4L60, it would not have been electronic in 1992 (not a 4L60E, but just a 4L60). So the easy question is: does your throttle have a TV cable attached to it? If so (and it probably is), then you have the 4L60/700R4. It's useful, fun, and sometimes frustrating using the online decoders. As many others here have said, some of the info is just plain wrong.

 

[351FUN]

With respect to the OP's original question, it should be easy to tell which transmission you have. The decoder says 4L70"E" (emphasis added on the "E"). If you have the 4L60, it would not have been electronic in 1992 (not a 4L60E, but just a 4L60). So the easy question is: does your throttle have a TV cable attached to it? If so (and it probably is), then you have the 4L60/700R4. It's useful, fun, and sometimes frustrating using the online decoders. As many others here have said, some of the info is just plain wrong.

Absolutely would have been the easiest way to check, when I made the post the truck was at the shop where it's been since March (and where it is again after having it home all of one day.) One of the things I had to fix after I got it home actually was the tv cable being floppy loose.

 

[pressureangle]

It's a 1992 blazer Silverado, I know it's a 4 speed auto and that's about it. I'd never even heard of the 4L70, and I'm not sure if I'm reading this right or if it's saying that was an option on diesels (which this one isn't). Quick Google search says the transmission started in 1992 in some GM suv's, but I've always heard I had a 60

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SuperMatic 4L70-E 4WD Automatic Transmission: 19368612 | Performance

The 4L70-E 4WD automatic transmission is based on the 4L60-E/4L65-E with increased horsepower and torque capacity. View additional specs and features.

www.chevrolet.com