47re no overdrive with manual switch

[big_bran]

Long story short truck is a 99 ford f250 with a 97 cummins and 47re from the same truck.

The donor truck had no overdrive before i stuffed it in the ford. Now i have it all in the ford and the truck drives great... except i have no overdrive.

today i decided to wire in a manual switch for overdrive. I bought a 2 prong 20 amp toggle on off from napa. Hooked brown wire that goes to b21 for overdrive solenoid control directly from transmission to the switch. The other prong directly to known good ground.

I still have no overdrive.

Before i drop the pan and start replacing solenoids, is there anything else i need to check for? or does having a manual switch eliminate all of them except bad od solenoid, or bad od unit?

thanks in advance for your help.

 

[zstroken]

You can put a gauge on it.

 

[big_bran]

Don't know why I didn't even think of that. . Must have been a long day

 

[cumminss2000]

Put a gauge on it. I had the seal on the outside of the apply piston blow out.

 

[big_bran]

ill throw a guage at it on saturday.. gonna go ahead and order an od solenoid so i have it on hand..

 

[BlackSkyRacing]

Put a gauge on it. I had the seal on the outside of the apply piston blow out.

Very common problem... clutches get worn out, piston over extends and blows out the seal.

Definitely put a gauge on it :Cheer:

 

[gavngrav]

OD solenoid "male" prongs on the trans house plug will corrode. Thats what was on my 91