93 cummins tranny

[adam greene]

i got a 93 cummins auto matic the tranny dont go into od till 60 mph is that ok it seems like the truck is sceaming before changing into overdrive.

 

[Granny]

Sounds like the Throttle Valve Cable is out of adjustment.

 

[1stgenxxx]

welcome to the world of suck ass dodge auto transmissions

 

[adam greene]

how do you adjust that, i no bout the trannys my dads 01 has had bout 4 in it, i wish this one would have been a manual

 

[1stgenxxx]

buck up and swap a 6speed in it.

 

[adam greene]

that be to much work its got to be something simple it shifts fine through the other gears. i read something bout putting a toggle switch for the overdrive does anyone heard of that or know how to do it

 

[adam greene]

anyone know how to adjust the cable, or fix it some how

 

[maddog411]

Does it wind out really far before it does the 1-2 shift and 2-3 shift? If not adjusting the throttle cable won't help.

It's probably the same as the tranny in my '94.....the 1-2-3 shifts are controlled by hydraulic pressure but the TQ lockup and overdrive shift are controlled by a computer. If so, the throttle position sensor might be going out. You can manually wire up TQ lockup and overdrive to switches. You will need the switches connected on the other end to a ground.

 

[StretchASU]

http://www.cumminsforum.com
http://www.dieseltruckresource.com

are both good resources for this truck. You can mod the truck with a toggle switch that will allow you to manually lock and unlock the convertor. No clue on how to adjust the throttle valve cable but checking the TPS is a good place to start like maddog described.

 

[adam greene]

i read a few of the articals bout wiring up the switch but i couldn understand it

 

[adam greene]

also it shifts good in all the other gears

 

[maddog411]

i read a few of the articals bout wiring up the switch but i couldn understand it

You have to tap into the wires that go between the computer and tranny. I chose to do it right at the tranny. You should have a plug on the left side with 3 wires. Be careful, there might be 2 plugs with 3 wires each so make sure you get the correct one. One wire is ground, one is for TQ lockup, and one is for OD. I'd have to lookup the colors for each. You would basically wire the TQ wire and OD wire like this (separate from each other)


Computer
|
|
------------------ Switch ------------ Ground
|
|
|
Tranny



If you T it like that, when the switch is off the computer controls it like normal. Switching either of them on only works when the tranny gets into 3rd. Switching the TQ lockup on will ground that wire and force a lockup. It will stay locked up as long as the switch in on. You can even stall the truck out if you slow down too much, just like a manual with the cluth engaged. Switching on the OD will force the truck into OD and it will stay there until you flip the switch off.

 

[adam greene]

so wire the tq lockup and the overdrive togather into one wire, run it to a switch and ground a wire and run it to a switch

 

[adam greene]

i hope it aint a tps there $270

 

[adam greene]

thanks guys i fixed it i adjusted the tps about a 1/4 inch and od kicks in bout 40 mph works good now.

 

[paradisePWoffrd]

The switch trick only works for trannys with lockup, and not all the 1st gens with OD trannys had lockup...

 

[sqrl$$]

'93 model had OD, but not locking T/C. Lockup switch is of no use on this first gen.

 

[adam greene]

i fixed it by adjusting the tps