Question for Steve83
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Cargo Master
Joined: Mar 2003
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Question for Steve83
In your article on Broncodata.com, about recalibrating the PSOM, you make mention that a ring and pinion change doesn't affect unit. (maybe I'm assuming this).
When I regeared, my e4od had a fit and was puking fluid all over the place and was slam shifting and operating erratically .
No one knew what to do about it, including several Ford dealers.
Finally I found a Ford dealer that specialized in trucks and they knew exactly how to fix. I don't know exactly what they did, but it had something to do with the speedo.
My question to you is:
Would this "tranny fix" the dealer performed possibly be the same calibrating method that you make reference to or something entirely different?
When I regeared, my e4od had a fit and was puking fluid all over the place and was slam shifting and operating erratically .
No one knew what to do about it, including several Ford dealers.
Finally I found a Ford dealer that specialized in trucks and they knew exactly how to fix. I don't know exactly what they did, but it had something to do with the speedo.
My question to you is:
Would this "tranny fix" the dealer performed possibly be the same calibrating method that you make reference to or something entirely different?
Thread Starter
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Cargo Master
Joined: Mar 2003
Posts: 2,333
Likes: 296
Question for Steve83
That's all understood.
My question is am I interpreting the following quote from a previous thread incorrectly?
Larger tiresor fewer teeth on the tone ring require a lower constant - R&P changes have no effect . When you have the constant you want, press the Reset button to lock it in.
Does this mean that ring and pinion changes have no effect on the constant? or the speedometer in whole?
Is there a different adjustment for the gear change?
My question is am I interpreting the following quote from a previous thread incorrectly?
Larger tiresor fewer teeth on the tone ring require a lower constant - R&P changes have no effect . When you have the constant you want, press the Reset button to lock it in.
Does this mean that ring and pinion changes have no effect on the constant? or the speedometer in whole?
Is there a different adjustment for the gear change?
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Cargo Master
Joined: Mar 2003
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Question for Steve83
There WAS an adjustment needed in my case, and yes, it solved the problem.
Perhaps a new speed sensor ring was used with the new ring and pinion I had installed, and it had a different amount of teeth from the original.
This is the only scenario that makes sense at this time.
I think I'll check my old gearset to see if it has the speed sensor ring with it.
From what I can tell, the constant is the only adjustment that can be made to the unit, so this must be what Ford did to solve my problem (7 yrs ago).
Perhaps a new speed sensor ring was used with the new ring and pinion I had installed, and it had a different amount of teeth from the original.
This is the only scenario that makes sense at this time.I think I'll check my old gearset to see if it has the speed sensor ring with it.
From what I can tell, the constant is the only adjustment that can be made to the unit, so this must be what Ford did to solve my problem (7 yrs ago).
Last edited by McLeod; Apr 3, 2003 at 01:49 AM.
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Post Fiend
Joined: Nov 2002
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From: Memphis, TN
Question for Steve83
Sorry - I've been busy the past few days with work 
& my gf's birthday. 
This Saturday, we head for Disney World! 
Don't look for any more posts from me until after the 14th. 
Anyway, the answer (if I understand the question) is: no, there is NO adjustment necessary to the E4OD or 4R70W transmission or the PSOM for a gear change. The PSOM sends the speed signal to the EEC, which controls the shift points, regardless of the rear ratio.
If you have a mechanical automatic (like the AOD or C-6), you do need to adjust the kickdown/TV cable &/or the bands for peak shifting.
All rear diffs since '87 have the tone ring, which is pressed onto the differential carrier. It's possible the shop that changed the gears left it off or damaged it. (Some else recently asked me about this and it turned out the mechanic had dropped the carrier & bent the tone ring.) You can see it in the GP pics album in my signature link.
& my gf's birthday. This Saturday, we head for Disney World! Don't look for any more posts from me until after the 14th. Anyway, the answer (if I understand the question) is: no, there is NO adjustment necessary to the E4OD or 4R70W transmission or the PSOM for a gear change. The PSOM sends the speed signal to the EEC, which controls the shift points, regardless of the rear ratio.
If you have a mechanical automatic (like the AOD or C-6), you do need to adjust the kickdown/TV cable &/or the bands for peak shifting.
All rear diffs since '87 have the tone ring, which is pressed onto the differential carrier. It's possible the shop that changed the gears left it off or damaged it. (Some else recently asked me about this and it turned out the mechanic had dropped the carrier & bent the tone ring.) You can see it in the GP pics album in my signature link.
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Thread Starter
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Cargo Master
Joined: Mar 2003
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Question for Steve83
Thanks Steve and have fun!
You're probably right . I never changed the constant when going from factory 29" tires to the 33" ones several years prior.
Maybe the difference in the engine load the computer was picking up after the gear change was enough to confuse it. Probably was tire size related.
You're probably right . I never changed the constant when going from factory 29" tires to the 33" ones several years prior.
Maybe the difference in the engine load the computer was picking up after the gear change was enough to confuse it. Probably was tire size related.