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I swapped out a 2003 4L80E transmission for a 19994L80E transmission that was running fine in my friends Suburban that was working fine whith no trouble but it will not engage now. Any suggestions?
Igot a 1999 4L80E transmission out of a Suburban and put it in my 2003 GMC Sierra 2500HD but it will not engage. My friend said it was running fine the last time it was used. What do you think is my problem?
Re: I swapped out a 2003 4L80E transmission for a...
They are different years 1999 is up to 2000/2001 then the 2003 is 2001 to 2004/5. auto box module works different, box's look the same but the sensors are different inside you would need to change the auto module and pair it to your ecu on your engine.
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not a faulty transmission at this stage but problem servo/ solenoids
run the fault codes to determine which units are the problem
could even be a pressure regulator for the pump that has gunk in it from your flushing
To really flush out a transmission you have to have the engine running and tap into the transmission cooler lines
That pumps the old oil out at the same time pumping fresh oil in
That process removes all contaminants from the torque converter as well as the transmission systems
An accredited transmission shop can do that change for you
How long have you owned it? Is it possible there is a shift kit installed for towing? Was there something that was done just before it started doing this? A tune up perhaps?
Hi Jesse, You need to get the correct management system and probably the wiring harness to go with it. It will also require someone conversant with electronics and who knows the circuit of the vehicles concerned. Regards John
As dependable as all the old suburbans must be, they can't defy GM's planned obsolescence schemes forever. I was trying to help a friend keep his '78 suburban's lighting going. It ran great, but looked like half the stuff under the dash had been broken at one time, and patched back together. The wiring was a real colorful mess. All you can do with the automatics is check the level and condition of the fluid. Never let it run low for long, or it will burn out. If the fluid looks burnt or dark brown, it's probably bad. You would want to have a shop or transmission shop verify or diagnose it to be sure, because rebuilding yours is a huge expense, just as a rebuilt one you could find would be expensive. A used one? You are always taking chances with a used transmission- it's real iffy. Lots cheaper, if you want to roll the dice, lol. Its your call. How fond are you of your suburban? .
Is the van rear wheel drive? Same transmission, same configuration? If they are, call your local salvage/junk yard. Some friendly guy there can check the Hollander Interchange Manual to see if it's a direct swap (that's about all the manual tells-yes or no, on a direct swap). If it's yes, clear sailin' for YOU! But if it's a no, you will have to find the differences to see if it's still a feasable venture. (I wanna know, too.) Several things come to mind: is gearing the same for same final drive ratio? Electronic shift points the same, same computer hookups, (the '97 would be OBD II) Can you incorporate the controls into your suburb? I hope you find an answer.
The check engine light should be on. With a scanner pull the transmission control codes. and follow up on their leads speed sensers ( thiers 3 and shift soliods ( thiers 4) the connectors and the wires and more likly to be a problem than hard parts as this transmission is thris on up shifteed sllectonically
Sorry friend there is no adapter between the transfer-case and transmission, if your lucky it's the transfer-case that is cracked and not the transmission housing. What could cause this??? Going over something high and the transmission hitting causing the housing to crack, or a worn transmission mount. Good luck and keep me posted, be glad to know you got your Suburban running again.
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