4-speed jumps out of 4-th gear

[charger1972]

I bought my 4 speed from Passon Back in 06 . Not a lot of miles on it but on deceleration it pops out of 4th gear . When it was purchased , it was the last one he had . A display one with the cover off . They reinstalled the cover while I waited . There is an a adjustment process when installing it right ? Could that cause my problem ?  That being said ,  I also have the wrong adapter plate on the trans for the shifter . And when I did this 4-speed conversion could only get the short linkage rods so had to lengthen them for my console car . Not sure if that would be an issue or not , but I think I`m gonna look for the correct linkage and plate . Any input would be great , thanks .

[Ghoste]

That would be the best place to start, linkage adjustment plays a big role and can easily have it not fully engaging.

[XH29N0G]

I had a similar problem that was related to linkage with reverse in a 8 speed.  I would check that first.  Don't know enough of the details of transmissions in general to suggest the step after that.  Assume someone here will.

[moparnation74]

Linkage adjustment is a great place to start.

[charger1972]

I all ways thought it was a linkage problem . Mainly because I modified it , and partly because I find it hard to believe a trans rebuilt by a reputable shop would have a problem so early . I will track down the correct parts and give it a try . Really hope that's it , don't want to pull it if not necessary . Thanks all for the input .

[John_Kunkel]

Was the bellhousing dialed in? Bellhousing misalignment problems will often show up in 4th gear.

[charger1972]

No , I never did . And it`s a scatter shield so ....... probably should have . 

[John_Kunkel]

If the bellhousing is way off-center it cocks the input shaft in such a way that the synchro dog teeth don't properly engage.

[charger1972]

If the bellhousing is way off-center it cocks the input shaft in such a way that the synchro dog teeth don't properly engage.

I hope that's not it . Really don`t want to pull it back out .

[c00nhunterjoe]

unfortunatly, you cant check it with the trans installed. i would start with verifying the linkage on the 3-4 shift and go from there

[Cooter]

I usually see this more with second/third gears, but if the "Dogs" on the actual GEAR are worn out, then a rebuild might not be the fix.

[charger1972]

I usually see this more with second/third gears, but if the "Dogs" on the actual GEAR are worn out, then a rebuild might not be the fix.

I`m hoping it`s just linkage misalignment because of the low miles on it , but we shall see .

[Cooter]

Keep us updated on what you find. ..

[ACUDANUT]

Keep us updated on what you find. ..

X2

[charger1972]

I will . Thanks .

[charger1972]

So I finally got the correct linkage and mount plate for my car . It shifts WAY better , don`t have to force it and when it goes into gear you feel it  lock in . But , unfortunately it still jumps out of 4th on deceleration . But it is way better ,  so probably gonna leave it till it gets parked for winter and deal with it then .