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hdgene, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 5635
Experience:  25 Years Automotive experience,ASE Master & L1 certified. Ford certified trans rebuilder
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I have a 99 f150 4.6 just put new moter in after driving 50

Customer Question

i have a 99 f150 4.6 just put new moter in after driving 50 mi the tran will jerk real bad after puting in Reverse and shutter and is geting harder to put in reverse
Submitted: 1 year ago.
Category: Transmissions
Expert:  hdgene replied 1 year ago.

Ok do you have a flashing overdrive light? You might have pinched the wiring harness for the trans between the engine and trans when putting back in. When trans shifts hard its usually in a failure management mode and set codes. Is the trans fluid full and clean or does it smell burnt? Any issues aligning the torque convertor with the flywheel?

Customer: replied 1 year ago.
at frist i didnt have torque convertor pushed all the way in tran.... no flashing light yes fluid full and clean not dose not smell burnt
Expert:  hdgene replied 1 year ago.

Ok, is the forward gears normal or are you engaging a different gear than you should in the other gears?

Expert:  hdgene replied 1 year ago.

Not sure if this is a 4r100 or a 4R75W

Customer: replied 1 year ago.
4R70wauto it only jerks when put in reverse. fills like it slips trueoutgears
Expert:  hdgene replied 1 year ago.

Ok need to check for any diagnostic trouble codes first to see if any pending codes are stored. Since you had some difficulty with the convertor long as you didnt force it and snap anything inside the trans front oil pump but that should make some sort of noise. Reverse commands the highest line pressure so if it didnt do this before it could be electrical or internal to the trans.