Possible valvebody issues
10-03-2015, 05:16 PM
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Possible valvebody issues
Im close to buying a used VB and cleaning that lol
As a brief back-story: I bought this thing with a blown up 700r4, with no 3rd/4th. The previous owner didn't understand the TV cable setup on 700r4's and just clipped it on. There was another issue which contributed to the 3/4 failure which I'll go over in a minute. When driving it would just freespin on the 2>3 shift. I could manhandle the throttle and get 3rd to bite and hold however it would never even attempt OD.
First let me say that this is my 4th transmission I've rebuilt (two 700r4s, one 4L60e, and a 4L80e) so I am by no means an expert but I believe my understanding of them is much above average.
Going back, upon r&r I found the 3/4 piston had pinched and torn lip seals. Trans got all new lip seals...well all seals in general, and was rebuilt. Governor was also serviced with a new gear and valve was free. The VB valves seemed to be tight occasionally, sometimes getting stuck in their bore more than normal (I think) while I was servicing and cleaning the VB.
With the new transmission together and in the truck, The issues at that point were:
1) I have 2nd gear starts in OD. I can manually select first and it gives me first.
2) there is a fair amount of 2>3 flare, Id say 500rpm surge at full throttle. 3/4 Clutch pack was set up at 0.030, if memory serves.
3) still no 4th gear. Trans stops at 3rd. Only difference between the OD and 3 position is engine braking in 3rd.
On a whim, I went to my local trans parts shop and bought a green box Gil Younger (TransGo SysKoKal system calibration) kit. I have installed the big blue box reprogramming kits before, however this kit had so many springs which look alike, that it was honestly overwhelming. I felt like an idiot because the blue box deals are supposed to be the worst to install LOL. I did my best on it and after reassembly I did get OD, but with a lot of 'screwing around' with the throttle. Everything seemed softer all around and it was still starting out in 2nd gear. I am considering getting a used valvebody and cleaning it up, but would still need some assistance with the syskokal kit if anyone (Dana?) knows it well enough to help. I know this is kind of long winded but thanks to those who read it and can help!
As a brief back-story: I bought this thing with a blown up 700r4, with no 3rd/4th. The previous owner didn't understand the TV cable setup on 700r4's and just clipped it on. There was another issue which contributed to the 3/4 failure which I'll go over in a minute. When driving it would just freespin on the 2>3 shift. I could manhandle the throttle and get 3rd to bite and hold however it would never even attempt OD.
First let me say that this is my 4th transmission I've rebuilt (two 700r4s, one 4L60e, and a 4L80e) so I am by no means an expert but I believe my understanding of them is much above average.
Going back, upon r&r I found the 3/4 piston had pinched and torn lip seals. Trans got all new lip seals...well all seals in general, and was rebuilt. Governor was also serviced with a new gear and valve was free. The VB valves seemed to be tight occasionally, sometimes getting stuck in their bore more than normal (I think) while I was servicing and cleaning the VB.
With the new transmission together and in the truck, The issues at that point were:
1) I have 2nd gear starts in OD. I can manually select first and it gives me first.
2) there is a fair amount of 2>3 flare, Id say 500rpm surge at full throttle. 3/4 Clutch pack was set up at 0.030, if memory serves.
3) still no 4th gear. Trans stops at 3rd. Only difference between the OD and 3 position is engine braking in 3rd.
On a whim, I went to my local trans parts shop and bought a green box Gil Younger (TransGo SysKoKal system calibration) kit. I have installed the big blue box reprogramming kits before, however this kit had so many springs which look alike, that it was honestly overwhelming. I felt like an idiot because the blue box deals are supposed to be the worst to install LOL. I did my best on it and after reassembly I did get OD, but with a lot of 'screwing around' with the throttle. Everything seemed softer all around and it was still starting out in 2nd gear. I am considering getting a used valvebody and cleaning it up, but would still need some assistance with the syskokal kit if anyone (Dana?) knows it well enough to help. I know this is kind of long winded but thanks to those who read it and can help!
