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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.


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Old 11-21-2019, 11:33 PM   #1 (permalink)
detroitMachine
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difference between 94 and 95 4L80E

Hi all

I have a 94 K1500 with a 4L80E. Local guy has a 95 4L80E out of a 6.5

Visually they look similar, the cooler lines are both close together on both trannies, and there is no top bolt on the bell housing. They are also both OBD1 which should be in my favour

My research has resulted in the following differences, let me know if I am missing something
- the donor's 95 has a neutral safety switch? No idea what this means? Just a note, my 94 wont start unless it is in P or N, so does this mean I have one too
- the donor's 95 does have a longer shifter arm pin, this needs to be swapped with my 94 arm pin, to get to this, remove the pan?
- my 94 can be shifted out of gear without pressing on the brake, the donor's 95 I don't think you can? Is this a tranny consideration or is this somewhere else?
- shift linkage, I was told I can just use mine out of the 94 since it is different.

Thanks!!!!

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Last edited by OkDually; 11-21-2019 at 11:41 PM. Reason: prefix
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Old 11-22-2019, 06:59 PM   #2 (permalink)
Glagulator
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You are good to go.
94 does not need the neutral safety switch.
You do need to swap the shift shaft so your existing shift linkage will work.
Press brake to shift is not part of the transmission.
You need to use your existing 94 shift linkage.
Otherwise the trannys are identical.
Only other consideration, is the 95 a 4wd?

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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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