Tranny problem - Ram 1500 4.7
Tranny problem - Ram 1500 4.7
Hello i have a problem with my 2002 ram 1500 4.7 4wd quad cab...
when i put it in reverse, sometimes it is like it's still in neutral, even if i rev the engine the truck doesn't move... i have to put it in neutral and then in reverse to correct it... maybe i have to repeat the operation two or three times....
i have a check and get the P0736 code (incorrect reverse gear ratio), it's pending...
what do you suggest ? does a '99 grand cherokee wj 4.7 tranny works on my ram ? here in italy i can find grand cherokee tranny easier then ram tranny...
thank you !
when i put it in reverse, sometimes it is like it's still in neutral, even if i rev the engine the truck doesn't move... i have to put it in neutral and then in reverse to correct it... maybe i have to repeat the operation two or three times....
i have a check and get the P0736 code (incorrect reverse gear ratio), it's pending...
what do you suggest ? does a '99 grand cherokee wj 4.7 tranny works on my ram ? here in italy i can find grand cherokee tranny easier then ram tranny...
thank you !
Professional
Joined: Mar 2008
Posts: 138
Likes: 0
From: Detroit Suburbs
RE: Tranny problem - Ram 1500 4.7
I used to work for a transmission company (that shall remain nameless, the bastards), and a common problem that would result in a situation like what you are describing is a simple miscalibration, or the wearing out of the PRNDL switch (or inhibitor switch, or whatever Dodge decided to call theirs.. It's all the same damn thing).
When you move the shifter the first time, most likely from the Park position, the PRNDL switch isn't moving far enough, and is giving the incorrect reading to the computer. When you go past Reverse into Neutral, and then return the shifter to Reverse, the switch is moving to Reverse from the opposite direction, and is making correct contact and can now give the computer the correct information.
I believe either adjusting or replacing that switch will probably correct the problem. And it's a hell of a lot cheaper than a new transmission.
When you move the shifter the first time, most likely from the Park position, the PRNDL switch isn't moving far enough, and is giving the incorrect reading to the computer. When you go past Reverse into Neutral, and then return the shifter to Reverse, the switch is moving to Reverse from the opposite direction, and is making correct contact and can now give the computer the correct information.
I believe either adjusting or replacing that switch will probably correct the problem. And it's a hell of a lot cheaper than a new transmission.
Record Breaker
Joined: Jul 2007
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RE: Tranny problem - Ram 1500 4.7
Moe in Wichita, KS mopar auto trans
I am not a trans expert. This is just what I have learned about mopar trans over the last 40 years
On the older mopars the Trans would not go in reverse when the Trans oil filter was clogged, cold weather made this worse. Why rev. and not forward gears? Because rev. runs the trans. line pressure to 350 psi. forward gears to 100 200 psi. the higher pressure takes more volume of oil that the clogged filter can’t pass. but I don’t know about the newer trans. Also the older trans stops the lube line in park so in hot weather don’t sit idling in park. If your older mopar trans bangs real hard going straight to rev. try going to low with the lever, then go rev. it wont bang as hard. But it really needs a low/rev band adj. A trick to get longer life is to put rear end grease in a trans, one or two qts. Two works good in 727s. It will shift better to. I have used this trick on the older trans, 727, 904s with no bad effects. This may or may not work on newer trans. I have put one qt in my 99 Dakota v 6. about 8 mo ago, so far so good. A cooler is ALWAYS a good idea. I have had shift kits in two trans, I think they are good. Just don’t do full race kit on a street trans. I understand the newer trans have a check valve in the cooler lines. So if one of these trans blows up the check valve will hold junk and keep the fluid from lubing the trans. So the valve needs cleaned after a blowup.
get in touch with these guys. i have known them from the 60 s they are honest. 90% of ALL trans shops get parts fro a & reds. they will know the answer to any question. I am not a trans expert. This is just what I have learned about mopar trans over the last 40 years
On the older mopars the Trans would not go in reverse when the Trans oil filter was clogged, cold weather made this worse. Why rev. and not forward gears? Because rev. runs the trans. line pressure to 350 psi. forward gears to 100 200 psi. the higher pressure takes more volume of oil that the clogged filter can’t pass. but I don’t know about the newer trans. Also the older trans stops the lube line in park so in hot weather don’t sit idling in park. If your older mopar trans bangs real hard going straight to rev. try going to low with the lever, then go rev. it wont bang as hard. But it really needs a low/rev band adj. A trick to get longer life is to put rear end grease in a trans, one or two qts. Two works good in 727s. It will shift better to. I have used this trick on the older trans, 727, 904s with no bad effects. This may or may not work on newer trans. I have put one qt in my 99 Dakota v 6. about 8 mo ago, so far so good. A cooler is ALWAYS a good idea. I have had shift kits in two trans, I think they are good. Just don’t do full race kit on a street trans. I understand the newer trans have a check valve in the cooler lines. So if one of these trans blows up the check valve will hold junk and keep the fluid from lubing the trans. So the valve needs cleaned after a blowup.
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