nv4500 swap issues - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tiger Joe · 10-02-2017, 10:36 AM

just got done restoring our 70 C-30. swapped an nv4500 in during the process.

bought the trans used last year. did not get to see the trans operate(other than shifting it on the floor) before we bought it.

issue- trans grinds going into 3rd on the unshift. downshifting from 4th to 3rd its damn near impossible to get it to even go into 3rd (almost like you hit a wall when shifting). trans shifts perfectly into every other gear and shifts fine when truck is off.

yes i purchased the correct fluid.

am I correct in thinking the 3rd gear synchro is probably toast? could there be anything "stuck" with it sitting for well over a year? anything I can do/check other than just pulling the trans?

10-02-2017, 10:36 AM	#1
Tiger Joe Registered User Join Date: Mar 2015 Location: South of Pittsburgh Posts: 425	nv4500 swap issues just got done restoring our 70 C-30. swapped an nv4500 in during the process. bought the trans used last year. did not get to see the trans operate(other than shifting it on the floor) before we bought it. issue- trans grinds going into 3rd on the unshift. downshifting from 4th to 3rd its damn near impossible to get it to even go into 3rd (almost like you hit a wall when shifting). trans shifts perfectly into every other gear and shifts fine when truck is off. yes i purchased the correct fluid. am I correct in thinking the 3rd gear synchro is probably toast? could there be anything "stuck" with it sitting for well over a year? anything I can do/check other than just pulling the trans?



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