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Southern Alberta Canada | Give us the numbers off the transmissions, I'd say you replaced a ten speed overdrive with a thirteen speed direct so basically you have lost a half gear overdrive ratio.
.75 for the ten speed and .87 for the thirteen speed so your top gear engine speed at 74 has gone from 1700 to 1972rpm, this are pretty long legs anyway. The advantage is you can split the top gears and get into optimum power if you need it now.
As far as the engine stumbling with the speedo hooked up, that makes no sense at all. Speed limiting on a diesel engine just governs it, it's not going to stumble, that is really weird. You must have it shorting out or something, does the speedometer shutter or vibrate too? Is it accurate? The sensor isn't too close and rubbing on the pickup ring is it?
Edited by Offroadnt 9/2/2014 08:06
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speedometer / cruise control issue in fld 120
