4R100 No Forward/ Reverse
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4R100 No Forward/ Reverse
Hello my names Robert,
Looking for some info on the 4R100. I’ve looked over forums but haven’t seen this problem exactly. I have 2001 F-350 Superduty with 7.3 Diesel 4x4 with Automatic 4R100. The trans has been rebuilt by the previous owner and its never had a problem and has always shifted good and firm. Until now,
Left a stoplight and got up to about 30 MPH and a loud bang then nothing. No forward and No Reverse. You can hear the idle change when put into gear. Checked the T-case and is ok. Transmission output shaft does not spin in D or R but does lock in park. Assumed the input shaft was broken but pulled the tranny out and it is Not. Fluid is clean and nothings in the pan. Of course it has a code for the output speed sensor with the OD light flashing. However, line pressures all seem Really High.
The Pressures in gear are
P/N 85
R 170
D 85
2 175
1 160
Stall pressures are
P/N 210
R 300
D 210
2 180
1 210
Thanks,
Looking for some info on the 4R100. I’ve looked over forums but haven’t seen this problem exactly. I have 2001 F-350 Superduty with 7.3 Diesel 4x4 with Automatic 4R100. The trans has been rebuilt by the previous owner and its never had a problem and has always shifted good and firm. Until now,
Left a stoplight and got up to about 30 MPH and a loud bang then nothing. No forward and No Reverse. You can hear the idle change when put into gear. Checked the T-case and is ok. Transmission output shaft does not spin in D or R but does lock in park. Assumed the input shaft was broken but pulled the tranny out and it is Not. Fluid is clean and nothings in the pan. Of course it has a code for the output speed sensor with the OD light flashing. However, line pressures all seem Really High.
The Pressures in gear are
P/N 85
R 170
D 85
2 175
1 160
Stall pressures are
P/N 210
R 300
D 210
2 180
1 210
Thanks,
More Turbo
Joined: Apr 2008
Posts: 515
Likes: 6
From: North East Arkansas.
OK. You have the transmission out of the truck? Can you turn the output shaft by hand? Can you post some pictures of the tranny? I've heard transfer cases exploding before. But if the truck will hold its position in park, the transfer case is fine. Park is a mechanical lock that engages a cog on the output shaft.
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4R100 No forward/ Reverse
No it’s back in the truck now (wanted to check the pressure since I didn’t before pulling it the first time assuming it was a broken input). Have to pull it again.
But when it was out- the input shaft isn’t broke and you can turn it no problem and locks into the converter when put into it. The output shaft on the transmission will turn pretty easy counter clockwise and will turn clockwise but really hard. The transfer case input and output both spin together. Put it in gear even without the T-case off and the trans output doesn’t do anything. No grinding even when put back in park.
Thanks
But when it was out- the input shaft isn’t broke and you can turn it no problem and locks into the converter when put into it. The output shaft on the transmission will turn pretty easy counter clockwise and will turn clockwise but really hard. The transfer case input and output both spin together. Put it in gear even without the T-case off and the trans output doesn’t do anything. No grinding even when put back in park.
Thanks
More Turbo
Joined: Apr 2008
Posts: 515
Likes: 6
From: North East Arkansas.
rhundley, You look new to this site so a few things to know. If Mark says something is broke, Its broke. Transmissionbench.com greatly helped me rebuild my tranny this summer. And I'm no mechanic. If you keeps thing organized, it will go a lot better.
Butt-Head
Joined: Apr 2004
Posts: 9,449
Likes: 2,934
From: Reed Point, MT
You were able to stall test it? It is not free-revving in any forward range or reverse? If that's the case and you have no motion in either direction, something is bound up GOOD!
Were you able to tow it with the engine running?
This was my latest cream puff....no motion...but there was no load on the engine at any time regardless of range so stall testing was not going to happen. This is the overdrive planetary...the part the input shaft is splined to. If it or the input shaft comes apart, you will have nothing but a spinning pump but you will not be able to load the engine to check stall pressures.
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4R100 No Forward/ Reverse
Yes you can feel it go into gear so I was able to do the stall test but nothings there. Yes it is was able to be towed with the engine running while in Neutral. I’ll have to pull it and tear into it. Will I have to pull the valve body to get to the forward drum and intermediate shaft?
Thanks for the info guys.
Thanks for the info guys.
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Butt-Head
Joined: Apr 2004
Posts: 9,449
Likes: 2,934
From: Reed Point, MT
Yes because the center support has to come out and it's bolted in above the valve body. You will need to find/build a tool to compress the overdrive clutch piston spring first though since there is an internal snap ring held in the case under pressure. Otherwise these things come apart with a flat screwdriver and external snap ring pliers.
Just plan on tearing the whole thing apart because there is likely a collection of shrapnel somewhere.
Just plan on tearing the whole thing apart because there is likely a collection of shrapnel somewhere.
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More Turbo
Joined: Apr 2008
Posts: 515
Likes: 6
From: North East Arkansas.
Cleatus is correct. You will even have to pull the filter in the pan before you pull the pump. Doesn't matter how long ago the rebuild was, just plan on doing it again. If you have already pulled and reinstalled tranny, you can rebuild it.
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