A trans question for Crosley.....

[SKR8PN]

Is it possible to retrofit a late model (like a 4L80E?)GM overdrive into an earlier (1989) Chevy/GMC 454 dually??  I am in the market for a used one ton single or dual rear wheel truck,but I don't want to spend the price for a later model truck,and I SURE don't wanna spend the money to FEED a big block with a 400 turbo behind it... At least,not if a tranny refit would be feasable.

What says the tranny guru??

[Crosley.In.AZ]

Bolt a Gear vendors OD unit on the t-400.

Costs of a 4L80E is some what high. IF you go looking for a L80E find a 1996 or newer. They are ID'd by the placement of the cooler line fittings. ONE fitting near the bell housing , the second fitting is near the rear of the main case

The 4L80E will bolt in. Drive shaft will need adjustment , move the cross member

You would need a controller for the L80E since it is full electronic control.

www.compushift.com is the controller to use if you go the L80E route.  VERY adjustable controller, good tech support

[SKR8PN]

Thanks Crosley!!  After I priced a trans and a controller,that GearVendors setup is looking more and more promising

[Crosley.In.AZ]

Thanks Crosley!!  After I priced a trans and a controller,that GearVendors setup is looking more and more promising

On other item on a 4L80E conversion  is the speed-O.  The L80E never had a mechanical speed-O..... you must use a speed sensor. There are various conversion devices that provide a mechanical feed for a speed-O for an older vehicle.  This just adds more $$$ needed for the conversion.