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Swapping 1999 into 1995 k3500

Jaryd

Love my 6.5
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Location
Hodges, SC
#2
Welcome man. Good to have you.

I'm not a transmission guy so you are getting what you are paying for on this one. I'm pretty sure there ain't a big difference in the transmissions for the years you are talking about. I think you would be ok with the swap.

Now if you were going from 4l60 to 4l80. That would be a different story.

@THEFERMANATOR to the rescue

He will hook you up with anything you need to know
 

Jaryd

Love my 6.5
Messages
844
Likes
1,116
Location
Hodges, SC
#4
The ones that say it's not possible are probably thinking of 4l60 to 4l80. It is possible to make that swap but that swap takes a lot of mods I think.

It may just be the trans cooler adapter that you will need for your swap though. As soon as @THEFERMANATOR sees this he will let you know exactly what you are going to need to do.
 

THEFERMANATOR

FRANKENBURBAN
Staff member
Lead Moderator
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ZEPHYRHILLS FL
Staff #5
Its a 4l80e to 4l80e I was told by some its just an cooler line adapter I need and others say its not possible. Hopefully @THEFERMANATOR can clarify
Yep, that's it. You used to be able to buy the adapters pre made. Just make CERTAIN to use the correct trans fittings in the correct spot on the 99. One of the fittings is long(99% certain it's the rear one), and it will run dry on oil if you install the wrong fitting as it will dump the oil back to the pan instead of feeding the lube circuit. Only other thing is 97+ used 3/8" cooler lines vs the 5/16" of 96 and older, but it's not an issue to concern yourself with.
 
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