E4OD & 4.10 gears
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Junior User
Joined: Oct 2004
Posts: 93
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From: China Spring, TX (Waco)
E4OD & 4.10 gears
I know that the EEC receives input from several sensors to determine the shift points for the E4OD. I assume the VSS (vehicle speed sensor) is one of them and was wondering if a gear change is made from 3.55's to 4.10's, do the shift points occur at a higher RPM (same vehicle speed as it did with 3.55's) or does it shift based on engine parameters (throttle position, MAP, RPM, etc.)? Does the vehicle speed input come from the exciter ring in the rear end or does it come from the transmission/transfer case?
Thanks for any help.
cds
Thanks for any help.
cds
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
well with out knowing what year its hard to say because it was in both depending on year. do a search for speedo calibrating you will find out how to fix this issue.
why you going to 4.10's and your ofcourse doing the front axle as well correct
why you going to 4.10's and your ofcourse doing the front axle as well correct
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Junior User
Joined: Oct 2004
Posts: 93
Likes: 0
From: China Spring, TX (Waco)
My Bronco is a '96 EB 5.8L. I will be changing by front and rear gears as well as the gear case in the front to accomodate the larger gears. I want the gear change for better performance with the P265/70 R15's I normally run on the street, and to also run an alternate set of wheels with 31 x 10.50's.
I plan on changing the speedo drive and/or driven gear to keep the speedo accurate. Been going topless since the weather has been nice. I notice the truck wiggles a little more without the top. I wouldn't mind having a roll cage to stiffen everything up.
Later.
I plan on changing the speedo drive and/or driven gear to keep the speedo accurate. Been going topless since the weather has been nice. I notice the truck wiggles a little more without the top. I wouldn't mind having a roll cage to stiffen everything up.
Later.
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Vehicle speed info comes from the VSS no matter where its located. As for changing gears, BOTH 3.55's and 4.10's were available as OEM gearing so its not going to make much difference. The PCM will compensate for the difference in speed-to-engine rpm's just like it would compensate for a dead cylinder or a sticking EGR valve. It WON'T generate any codes though since the parameters in the software will not be out of the "acceptable" range since both gearings were OEM available. E4OD says its not gonna be much older than a 91 unless someone has swapped one into an older truck (reasons why would be an intriguing conversation). By then the VSS was in the rear axle housing. If you run the larger diameter tires with the 4.10's you will get your performance. If you swap between the two differtent tire sizes often you are going to have to choose which tires will give you a correct speedometer reading though.
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