Author Topic: 1991 Burban V2500 6.2L Diesel  (Read 894 times)

Offline Irish_Alley

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Re: 1991 Burban V2500 6.2L Diesel
« Reply #15 on: June 14, 2019, 08:43:52 PM »
that ecm is only going to power the transmission, you wont have any worries about the ecm and engine like you did before. on top of all that the 4L80e is going to be a lot stronger and more reliable OD trans in my opinion. that being said if you want to swap out the trans youre going to need to find one with an electric speed sensor or your speedo wont work right. the transfer case you have now will be a 32 spline and its the only OD trans thats a 32 spline besides a later model manual trans. the 700r4/4l60 will be 27 splines. you might be able to find a 700r4 and transfer case out of 89??? (cant remember what year they started the electric speedo), but then you need a new front and rear driveshaft unless you find that setup in a burb. im going to add one last thing, i have that setup in my 91 v3500 crew cab with a cummins in front of it, and i abuse it. i did away with the ecm as the cummins was a first gen and i didnt have the right sensors to run the stock ECM. the "black box" i installed lets me manually shift the 4l80e at the cost of full line pressure. so this trans is really getting abused and used.
« Last Edit: June 14, 2019, 09:30:23 PM by Irish_Alley »
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Offline fitz

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Re: 1991 Burban V2500 6.2L Diesel
« Reply #16 on: June 14, 2019, 09:24:40 PM »
Your 87 suburban had an ECM unless someone removed it.
The 6.2 in your truck is a mechanical engine. All it needs is 12v to the injector pump to be happy.
Irish covered the 6.2/4L80 computer set up, I wont beat a dead horse. I will say I'd if you remove that 4L80 set up from your truck, sell it on Ebay. Lots of guys want that set up.

Offline Irish_Alley

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Re: 1991 Burban V2500 6.2L Diesel
« Reply #17 on: June 14, 2019, 09:29:00 PM »
i know i would want it even if it just sat in the car port with my other cummins engine lol
If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline Deercreekfarm

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Re: 1991 Burban V2500 6.2L Diesel
« Reply #18 on: June 15, 2019, 05:00:46 AM »
Thanks for the feedback. Let me weigh my options here and come up with a plan.

Offline ehjorten

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Re: 1991 Burban V2500 6.2L Diesel
« Reply #19 on: July 15, 2019, 09:06:13 AM »
4L80e is pretty much bullet-proof!  I would keep it.  Plus you have overdrive which is key for these old trucks in making them much more enjoyable to drive!
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline JohnnyPopper

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Re: 1991 Burban V2500 6.2L Diesel
« Reply #20 on: July 15, 2019, 02:28:49 PM »
I feel your pain DeerCreeker!

Since it's been verified that a 700R came stock, I would go in that direction.

As far as the electronic control of that trans, there are aftermarket parts that accomplish that, and best of all, you control it.

The bonus of an overdrive is what I would find most interesting.