@001 Silverado Transmission swap Help!

[Fluxion]

Ok I have had to push my 67 firebird project to the side as my daily driver a 2001 silverado 1500 4x4 shed some parts of the sunwell. The trans is a 4l60e and I found a freshly rebuilt one on craigslist that came out of a 98 Tahoe 4x4. Turns out the guy had his trans rebuilt (showed me the receipt) and the Tahoe was totaled two weeks later. He had lots of stereo equipment and some expensive wheels so he bought it from the insurance co. Now he is parting it out. I struck a deal on it, gave him $100 to hold it and I am supposed to pick it up at 7am tomorrow cause I cant get anymore cash out of the ATM. I was jsut told that this may not work in my silverado due to different computer settings. I dont know where to turn for answers and I get good advice here so will it work? Should I try and cancel the deal? I gotta get my truck back on the road cause my wifes car is in the shop right now and they can't figure out whats wrong with it.

[Whistler]

The 98 had a Gen I SBC for an engine, your 01 has a Gen III. The two transmissions will physically interchange minus one bellhousing bolt. There are differences in the internals, but IIRC the plugs are the same. IF the plugs are the same color and same pin config( look closely, there will be some empty pins) it will probably work. The converters are different, you will need the converter from your 01.

[novaderrik]

is the bellhousing depth different on the autos like it is on the manuals?

[Whistler]

No, the flexplates are specific to each engine to space the converer correctly.

[MonzaRacer]

Heck even if you have fitment issues you should be able to swap hardpart internals IIRC.
IF your talking sun gear shell breaking it isnt that hard to fix either especially with good ,rebuilt side by side, kind of suck for the plug and play idea though.

[MonzaRacer]

OK from what I gather off of https://www.wittrans.com/Schematic.a...0E/4L65E/4L70E is if yo got it and wanna swap bellhousings, and as long as you feel ok about not having chunks in your old converter(or call local trans shop for fresh one or order from wit)just do the swap and use your converter, but sun gear shells are same. if you have other transportation ordering up all the parts to swap in a reinfirced sun gear shell and the better 5 pinion 4l65E planetaries does give you better trans.
But unless wit is wrong 98-2002 can interchange from parts stand point from what I see. This means swap bellhousing, either reuse or swap in new/reman converter and install.
Also do spring for the newer dexron tranny fluid, it has much better specs over dexron/mercon III or use mobil 1 synthetic for first change after up and running.
So far I a cant find any reason why it wont retrofit.
Good Luck

[Whistler]

I could be mistaken, but I think the pre GenIII transmissions don't have a removable bellhousing.

[CamaroAJ]

they won't swap. the sunshell is really easy to replace and will cost you around $400 in parts. it is really like one of the 5th things that come out when rebuilding. if all it really was is the sun shell then you would have forward gears with a noise and no reverse.