Thread: GM Tranny Q...

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I currently have a 4L60E. If I were to change that out to a 4L80E, would I also need to change driveshafts, or are they the same length? Any other problems that I may run into? Computer problems, etc?

Thanks.

dirve shaft is shorter and yoke is 400 size computer is different 4l80e has more electronics is smarter trans.wire harness to trans is different also fisrt gear is 2.5 to one 4l60e is 3.08 to 1

So you are saying that it's not a direct bolt-on replacement?

Dang. How much more work would then be involved in the swap besides the parts (tranny, computer, drive shaft, etc...)?

you also didn't say if it was 4 wheel drive different transfer case I build tranys for a living a lot of people ask about swaping manuals for autos I tell them its easier to sell the truck. I have done 400s to 700s witch is a lot easier than what you want but if you've got money to throw around go for it.

It's a '97 Silverado 2WD. It's getting close to another tranny rebuild and I was weighing my options to see if I could get an "upgraded" tranny that is a bolt-in replacement to my 4L60E that is about to see its 2nd rebuild.

I just don't want to rebuild it again...

how many miles are on it and whats wrong and who built it? If done right you should get at least a 100,000 miles out of it If you tow tow in drive 3 not overdrive

It's right at 40,000 since the rebuild (truck has 204K with the rebuild happening at 164K). The only thing that concerns me is that it is starting to get slower engaging drive.

I'm one of those guys that hears, feels, and sees every small difference in his ride...I'm sure most of you guys are the same. Anyway, when I start it up and put it in drive, there's about a second more hesitation before it engages drive...it doesn't do this in reverse, just drive.

Sometimes I have to give it a little gas to "help" it engage. I don't like doing that because it bangs into gear pretty hard when I do that.

Maybe it's because it's cold? Torque converter? Pump going out? Is there a "simple" solution?

Oh, and when I tow I'm in 3rd!

http://www.novak-adapt.com/knowledge/4l60e.htm

this might help

if it only happens in forward it can't be the pump or converter they work in reverse also. sounds like you forward piston seals becomeing britle will need an overhaul sometime in the future.

Thanks for the link, ls1. Quite handy.

So, you think the forward piston seals might be going out this early after a rebuild? A $1500 rebuild? <-- is that too much?

yes thats about average

Im not expert, But why would your trans be going so quickly? I have a 93 Suburban. Its my daily driver. Bought it with 72K on the clock. Now have 231K. Never rebuilt the trans since I got it so my trans has at least 159K on it. I have towed a car on a dolly from NJ to Florida....and towed a boat from Nj to Florida. Truck tows my boat quite a few miles on the weekends in the summer. Truck goes into 4wd on the beach 20-30x a year. I chage fluid and filter 2x a year at beginning of my boating season and at the end. Never had a power flush. I dont hesitate to drive the truck at 80 mph on the highway, yet I dont accelerate real hard either... as a kid with my first TH700 equiped suburban I got sick of the cost to have trans rebuilt yearly, so I eased up on the peddle on acceleration. So I dont understand why your trans is blowing so quick. Is the truck equipped with a large cooler? If not it should.

I know it it was me I wouldnt bring your truck back to the shop who did it last rebuild, as they most likely did no uprgrades, and not quality work.

Hmmm...I'll check on the cooler. I don't think there is one, but I can check and see. That would help a lot...and a pair of "lighter shoes" would also be in order.