4L80e?

[custm2500]

I am considering swaping a diesle into my "93 suburban and it has a 4L80E. What all motors will bolt up? I don't want a 6.5 because they sound like ****. The goal is fuel ecconemy so take that into consideration for what would be my best motor to bolt up to it. I don't run the truck hard and only occationaly tow my other truck to the track, about 7000 lbs truck and trailer. Reason I bring this up is if the duramax will bolt up I am not concerned about tearing the trans up.

Sum it up I want to swap a motor only and get the best fuel ecconemy I can. Right now i am getting 10ish city, 14 ish free way. My guess is a good diesel should get 16-20 city and a bit better on the hiway? Thanks.

I am not changing trucks either. I need the 8 passanger and the ability to tow so it fits the bill.

[RCpullerdude]

Cummins 4B3.9TA.

[custm2500]

I take it that is one out of a dodge? It will bolt up the the 80E?

[robotic_junky]

A lot people usually use the Dodge 47RE transmission that came with the Cummins.

Here's an adapter for 4l80e to Cummins.
http://www.transmissioncenter.org/cu...bt_adapter.htm

I've also heard some old bread trucks had the adapter on them since they run a GM transmission with the 4BT (3.9) Cummins.

Hope this helps.

[custm2500]

I am looking for a low($2000-$5000) option. At $3000 it would take around 20,000 miles to payfor the swap never pulling anything. Every mile pulling would save $.32 vs $.16 every mile of empty(round and concervative #s). So at 3 grand 15,000 miles on the clock should pay for it's self, obviously if I could get $300-$500 for my 454 and harnes that make the miles drop a good deal.

Again I am looking for a fairly lowcost option to make my fuel ecconemy better and something that will pay for it's self in 1-3 years depending how good a deal i find on a motor and how much I can get out of my BB. Unfortunatly that means a $1300 adapter is out of the question.

[robotic_junky]

Look for old bread trucks that might came with a 4BT Cummins or look for a wrecked Dodge Ram with a 6BT Cummins. Then use the transmission that is bolted to motor. That's what I would do.

[il_DURAMAX]

problem is when swapping alot of motors can be swapped and fit other trans with adapter plates, but as you see from the link above the adapter is usually very pricey.

I dont think your going to have much other option other than a 6.5 to mount up to your 4l80 without having to fork out the $ for an adapter.

But you'd probably be pushhin it to want to do a duramax swap for under 5 grand, the motors and donor trucks are still a fortune to buy usually.

[il_DURAMAX]

or look for a wrecked Dodge Ram with a 6BT Cummins. Then use the transmission that is bolted to motor. That's what I would do.

Probably your best bet.

Maybe buy a high mileage 12 valve for cheap, have it rebuilt and swap w/ an adapter and you'd have a pretty sweet set up and could probably get 20mpg

[RCpullerdude]

I take it that is one out of a dodge? It will bolt up the the 80E?

No. It is the 4 cylinder 3.9L version of the engine in a Dodge. The Dodges run the 6B5.9T/6B5.9TA/6ISB5.9TA/6ISB6.7TA. The 4B3.9, as mentioned, was put into bread trucks with THM400's, and so they have an adapter available to bolt the engine to a GM transmission. This adapter does tilt the engine, but it works. You will also need a TCM from a 91-93 6.2/6.5 with a 4L80E to run your transmission. You must remember though that swaps often cost a lot more than anticipated. I once worked on putting a 6B5.9 into a 92 F-250. He did everything as cheap as he could, even the engine was less than $2K. By the time it was driveable, he was into it for $5-6K and it was still nowhere near completed.

[thefermanator]

I know you said you don't want a 6.5, but that is pretty much your only option for your budget. It is pretty much a drop in fit as it will directly bolt in bolt for bolt for a 350 or 454. If you consider a 4BT what ever you think it will cost, double or triple it and you will be close to what the actual cost will be.

[custm2500]

What kind of millage does the 6.5 get? I am guessing it sucks and I would need 18ish mixed city/hiway to make it close to worth my wile. Also what are the HP and TQ numbers?

[robotic_junky]

Specifications

* Engine RPO Codes: L49, L56, L57, L65, LQM, and LQN.
* Displacement: 6.5L / 397 cu in
* Bore x Stroke: 4.06 x 3.82 (in.)
* Block / Head: Cast iron / Cast iron
* Aspiration: Turbocharged (Borg-Warner GM-X series) Also available naturally aspirated.
* Valvetrain: OHV 2-V
* Compression: GM Early 21.3:1, GM Late 20.3:1, AMG/GEP Marine 18:1
* Injection: Indirect
* Power / Torque (lowest): 180 hp (134 kW) @ 3,400 rpm / 360 lb·ft (488 N·m) @ 1,700 rpm
* Power / Torque (highest): 215 hp (160 kW) @ 3,200 rpm / 440 lb·ft (597 N·m) @ 1,800 rpm
* Max RPMs: 3,400

[custm2500]

Yea 215 and 440 sounds like a step backwards. I have mid 300 hp and nearly 400 torque already. That would be a bunch of money backwards for sure.