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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum


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Old 10-09-2019, 07:50 AM   #1 (permalink)
scasanova
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Join Date: Aug 2012
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New vs late model 4L80E questions

Does anybody know if a late model 4L80E can be swapped in a truck that has a early model 4L80E? I found a good deal on a rebuilt 4L80E with no core. I might just replace my trans and rebuild my current one as a spare. The truck is a 1993 C3500 2WD.

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1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon
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Old 10-09-2019, 12:20 PM   #2 (permalink)
Glagulator
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The main differences are-
 
1. The TCM/PCM is different 94-up, see info.
2. The 95-up shift shaft is different.
The early short shaft can be swapped.
3. Cooler lines are different, need to make adjustment.
4. If 2wd, make sure the tailshaft is correct for your truck.
Changing the tailshaft is a PITA.
5. Verify which PCS your 93 tranny has.
6. You should have the updated, current, main connector, but check it.
6. The 93 TCM will control a 94-up tranny if you use the correct PCS.
 
Some info -
 
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=21&ved=2ahU KEwiFkdG8x4_lAhVGQ6wKHferAaIQFjAUegQIBRAC&url=http %3A%2F%2Fwww.atra.com%2FBulletins%2F1995%2FAllYear %2Fatb266.pdf&usg=AOvVaw1WdnHl_3bxgDpl_d-XrHO1
 

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There are 10 kinds of people in this world; Those who understand binary and those who don't.

99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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Old 10-11-2019, 07:22 AM   #3 (permalink)
scasanova
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Join Date: Aug 2012
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Thanks for the information. The truck has the updated harness from the factory. Cooler lines are not a problem. It looks like the tail shaft is correct for 2WD. Can you tell me more about the up shift shaft?
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1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon
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Old 10-11-2019, 11:30 AM   #4 (permalink)
Glagulator
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This will show the diff. -


https://etesupport.zendesk.com/hc/en...c-Transmission-


Your shift linkage may not work with the longer (95-up) shift shaft.
They are not hard to exchange.
The 95-up have a park/neutral switch that the shaft runs thru, why they are longer.
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There are 10 kinds of people in this world; Those who understand binary and those who don't.

99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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Old 10-16-2019, 04:13 PM   #5 (permalink)
scasanova
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Join Date: Aug 2012
Location: Florida
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Does anybody know if a 1993 4l80e from a 2wd van will work in a 1993 2wd c3500? Is the tail shaft the same?
__________________
1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon
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Old 10-16-2019, 07:32 PM   #6 (permalink)
johnH123
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If they are both 2wd then yes. Should swap right in.
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1993 K3500- 4x4, single cab/long bed, single rear wheels, 4.10 rear end, F vin, Nv4500 manual, factory red interior.


Gone but not forgotten: 2001 silverado 2500hd CC/SB, 4x4, 6.0 vortec, 229k miles when I traded it.
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Old 10-16-2019, 09:10 PM   #7 (permalink)
Glagulator
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Location: Very south TEXAS, Formerly Wisconsin
Posts: 3,700
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The best way to tell is if the yoke on the transmission is bolted to the tail shaft or if it is a slip fit. The bolt on (a multi-piece shaft) has the u-joint strapped on like the rear yoke.
With the slip fit the u-joint is pressed on.
A 3500 normally has the bolt on yoke.
Not sure what a van has.
There is a difference in how they seal, the slip fit has a collar and o-ring seal on the inside of the tail shaft to keep ATF from leaking from the vent hole on the slip yoke.
That means a tranny with the bolt on yoke that is swapped to slip yoke is going to leak ATF because they don't have the collar seal. Look at a slip yoke, there is a vent hole to prevent hydraulic pressure as the yoke moves in and out. That mystery ATF leak that won't go away even after new tail shaft seal.
The other way works ok because the yoke is bolted on.
Best bet is to check fit the yoke you will be using because there is an assortment of tail shafts. You never know what has been changed on a used vehicle. FSM shows the various tail shafts.
__________________
There are 10 kinds of people in this world; Those who understand binary and those who don't.

99 CREW LONG SRW C3500 work truck 199k+ mi. orig. motor & trans 4.10, modded engine harness, new oil cooler & lines, all new front end parts and poly bushings, trans poly mount, all new brakes.
96 SUBURBAN K2500 wife's truck 210k+ mi. orig. motor & trans, 3.73...
95 C2500 Suburban 6.5td HO w/p, timing set, HB & pulley, all rubber hoses, modded engine & main harness, converted to OBD2, PMD to bumper...
95 C1500 Suburban 6.5td rebuild tranny, convert to DB2, replacing as many parts as I can.
96 C2500 Suburban 7.4L converting to 6.5td w/ DB2, 4L80, 3.73
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