Help! my 95 7.3 4x4 wont shift into any gear.

[chadland71]

ive been reading forums for hours now, and have'nt seen any specifics relating to this particular problem. oil is fine, and tranny didnt slip prior to this happening. could it be the tc? pump? anyone out there had the same prob and can advise?

[lwillson]

A weak pump will not build any pressure, and not shift any gears. I have a small leak in a check valve, and if my truck sits for a while, it takes a bit longer once a gear is selected to actually engage that gear (reverse is longer).

There is a pressure port on the side of the transmission. If you make up a hose with a gauge on it, and thread it into that port, you can see how much pressure there is.

[madpogue]

Does the truck stay put in Park?

[elrojo63]

Originally Posted by lwillson

A weak pump will not build any pressure, and not shift any gears. I have a small leak in a check valve, and if my truck sits for a while, it takes a bit longer once a gear is selected to actually engage that gear (reverse is longer).

There is a pressure port on the side of the transmission. If you make up a hose with a gauge on it, and thread it into that port, you can see how much pressure there is.

how much pressure should there be?

[lwillson]

Depends on the gear, I can't remember the specs off the top of my head, but should be in the 90-120 psi range

[lwillson]

e4od 2-3 shift free revs

[Yoslick]

Mine did the same thing, TC was fried and the pump was in a dozen pieces, no warnings, no nothing, came to a red light, hit the gas and went no where..... $2200 for a HD overhaul.... money well spent so far!!