Bump / Jerk when coming to a stop fixed???

[acoffeefiend]

OP
[ATTACH=full]534386[/ATTACH]

acoffeefiend​

Junior Member​

Bump when coming to a stop fixed??? Mechanic drove it when I had it in for the gear swap and noticed the "bump" when coming to a stop. He said it was hard downshifting into first gear most likely from the valves in the transmission sticking. I hadn't ever changed the trans fluid and figured I'd do it at 100K miles. (Found out later the reccomended change interval is every 60K miles. ) Did a full transmission flush and put in the PPE aftermarket pan that holds an additional 2 qts of trans fluid. He said the more I drove it the better it would get as the new fluid flushed out the valves. It is better than it was, not completely gone, but significantly better than it was.

Would love to hear any mechanics thoughts on valves sticking in the transmission causing this and any other fixes/cleaners to transmission valve sticking if it comes back or doesn't completely go away.

 

[pacofortacos]

Are you sure it isn't the driveshaft? Greasing the splines between the 2 rear driveshaft parts often helps that.

 

[Wild one]

OP
[ATTACH=full]534386[/ATTACH]

acoffeefiend​

Junior Member​

Bump when coming to a stop fixed??? Mechanic drove it when I had it in for the gear swap and noticed the "bump" when coming to a stop. He said it was hard downshifting into first gear most likely from the valves in the transmission sticking. I hadn't ever changed the trans fluid and figured I'd do it at 100K miles. (Found out later the reccomended change interval is every 60K miles. ) Did a full transmission flush and put in the PPE aftermarket pan that holds an additional 2 qts of trans fluid. He said the more I drove it the better it would get as the new fluid flushed out the valves. It is better than it was, not completely gone, but significantly better than it was.

Would love to hear any mechanics thoughts on valves sticking in the transmission causing this and any other fixes/cleaners to transmission valve sticking if it comes back or doesn't completely go away.

Supposedly the Zip Kit addresses some of those issues.

Zip Kit® - ZF8-ZIP

Sonnax Zip Kit ZF8-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in the ZF8HP45/55/70 and Chrysler 8

www.sonnax.com

Did your mechanic follow these instructions,especially the one about levelling the transmission,very few do,as they do the service on a lift.You need the rear tires roughly 8 or 9 inches in the air to level the transmission,if you don't level the transmission,it'll be low on fluid.

 

[acoffeefiend]

Supposedly the Zip Kit addresses some of those issues.

Zip Kit® - ZF8-ZIP

Sonnax Zip Kit ZF8-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in the ZF8HP45/55/70 and Chrysler 8

www.sonnax.com

Did your mechanic follow these instructions,especially the one about levelling the transmission,very few do,as they do the service on a lift.You need the rear tires roughly 8 or 9 inches in the air to level the transmission,if you don't level the transmission,it'll be low on fluid.

Yes, he loosed the three bolts and jacked the tranny up. I'll definitely keep this in mid if the issue doesn't resolve and take it to someone who specializes in transmissions. Thank you.