f4stunna

when i shift my 91 4X4 into reverse it takes a few seconds... like alot longer than it should... its an auto and i bought the truck for 300 bucks so im not surprized. it has 204,000 miles on it...

any clues what up?

Gizler00

iTrader: (1)

This is a dumb question but did you check to see if you have fluid in the trans. Filter might be clogged. also. But whatever you do, do not flush the trans at such a high mileage.

notanymore

just curious whats wrong with flushing a high mileage trans?

mt_goat

See the TIME LAG TEST from the FSM here:
http://personal.utulsa.edu/~nathan-b...35mechanic.pdf

If you fail the time lag test it shows one cause could be "Line pressure too low" I'd suggest checking the fluid level first, follow these directions:
http://personal.utulsa.edu/~nathan-b...32prelimin.pdf

If that's good, might want to drop the tranny pan and replace the ATF filter. Might also check that the ATF cooler isn't clogged.

It looks like the other possibilities involve a rebuild.

f4stunna

i can tell you right now if fails the lag time test... it says 1.5 seconds is the limit.... it takes at least 5-10 seconds to shift into reverse

ill check the other stuff later

mt_goat

Depending on how much you're willing to spend, while you have the tranny pan and filter off you might also consider sending the valve body off to be checked out, it controls line pressure. This is one company that I'd consider sending it to:
http://www.importperformancetrans.com/index.shtml

f4stunna

woudlnt it be cheaper and easier to get a rear end from a junkyard?

mt_goat

Rear end? What's the rear end got to do with it?

Gizler00

iTrader: (1)

It is not good to flush a transmission with high mileage because all the worn components such as the valves, valve bodies, pistons and servos are worn out of spec. As the transmission gets worn the fluid starts to break down and thicken, therefore filling in all the voids that opened up as a result of wear. And when you flush out all the old fluid with new, it cleans out all the old fluid thats trapped and clinging to the parts. And it lubricates as it should. As a result of this your transmission could start to operate poorly. And could eventually take a crap on you not long after. It is better to just leave the old fluid in the transmission. But if it is completely necessary you could drain the fluid in the pan and change the filter and hope for the best. This is just from my own personal experience.

Check out this Link for trans flushing!!
http://www.myhonestmechanic.com/arti...slipping.shtml

Heres a little part of it that gives info:
If your vehicle has high mileage (> 80,000 miles) and the transmission has not been maintained, I would not recommend replacing the fluid and filter. The fluid that has been in the transmission all this time has become dirty and gritty. This gritty fluid is actually providing needed friction for the worn internal parts of the transmission.

Changing the fluid and replacing the filter would remove this friction that the internal transmission parts have become dependent on. If you have not been regularly maintaining the transmission throughout the life of the car, you might actually be doing more harm than good if you replace the transmission fluid at this point. For example, putting new clean slick transmission fluid in an older high mileage vehicle could cause the transmission to slip.