Hi, I have a 1990 f250 with the 7.5 and it looks the the transmission (automatic) is starting to go out. I was just wondering what if any options do I have for a new one? Thanks.

 

what seems to be the issue with the trans? is there an over drive off switch located on the dash and does the axle code located on the inner,drivers side,door jam show: E?

 

Yes I have the overdrive (I tried reading up on it seemed best to leave it alone considering I don't know much about it and am worried about the transmission),no warning lights. It seems to shift gears pretty hard especially coming out of low. Also on the highway it'll start vibrating pretty good.

 

have you tried pulling codes and inspected the u-joints and tires for possible cause of the vibration already? these are pretty expensive transmissions to condemn without knowing the issue 100%.

 

Yeah u joints are fine and replaced the center carrier bearing. All the tires are good.

 

Driveline vibration at highway speeds could be a bent or out of balance driveshaft.. the aluminum versions are notorious for this. The 2 piece steel units must be perfectly aligned to prevent vibration, if the truck has a lift it will most likely need some changes to the carrier bearing spacer block to get the shaft as straight as possible and even then sometimes it will need a double cardian joint added at one end or the other.

A hard shifting E4OD is a classic symptom of a sensor problem, pull the codes to see what is flagged. Sensor issues will put the computer into a protection scheme and that is what produces the hard shifts, it's often something to do with either the TPS or the speed input.

 

Also not completely ready to condemn yet. However I am probably going to try to replace it with something from a salvage yard. Just wanted to know my options so I could start keeping my eye open. Thanks for all the help.

 

Do not blindly replace the trans without doing a ton of troubleshooting, this thing is 100% computer controlled and while it has some known mechanical issues in the early years it's more likely you just have a bad sensor or wiring/connector issue.

 

Thanks conanski super helpful! I'll go get codes pulled right now. And start trying to check out the drive shaft. It also has 250,000 hard miles on it and the the transfer case seems to be leaking if that helps

 

Got three different codes about the fuel pump 87, 95, 96. Just replaced the rear one

 

That sounds like a (possible) monumental waste of time and money. The one at the junkyard might be worse than what you currently have i.e. It might actually have mechanical issues which you may or may not have.

I talk to a guy that knows who bought my '94 Bronco and the guy is still driving it and loves the truck. It had 200K+ miles on when I sold it. Apparently replacing the TPS before I sold it, must have fixed the intermittent hard shifting issue I fought with for two years.

 

I agree with Conanski, entirely. I also agree that a salvage yard automatic transmission would be a bad idea. If it's truly going out, a remanufactured one from Ford or maybe another company. Occasionally, manual transmissions from salvage yards can work out fine, but autos... I wouldn't recommend going to all that trouble of swapping out transmissions when there's no guarantee it even works. If I was certain it was going out, I'd do the last ditch effort of pumping a quart of fluid out of it, & and add a quart of the Lucas trans. fix. and say a prayer.

Also, is the transmission fluid red, brown, or even black? Does it smell burnt?

Maybe have a trans. shop tech. take it for a drive?

 

How do you pull these codes. My 350 automatic is starting to randomly flash the overdrive button. I did some research that said it could be numerous things and I needed to hook my od2 reader to it. I did this and nothing came up and suggestions?

 

If I knew what truck you had I could tell you how to get the codes.

 

sorry I have a 96 F350 with a 460, and an auto trans.