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M5r1 help


rangerguy351

Active Member
Joined
Oct 6, 2009
Messages
27
Vehicle Year
87 ranger
Transmission
Automatic
Iv got a 94' and the trans had a whine to it in 1-2-3-5 and heard that it's a sign something it getting out if I tore it apart but don't see anything that looks bad. Only thing maybe is the input shaft at the thrust washer with the i.d needle bearing has slop their. What is the most common fix for this? Maybe if someone had a spec sheet for that tollerance that would be a huge help. Thanks guy's
 
Sound like counter shaft.... but they do have a rebuild kit for it for cheap

Sent from my SAMSUNG-SM-G870A using Tapatalk
 
I agree with the monster. The 'counter shaft' or if you are English, layshaft, is supported by bearings at both ends, and is in constant mesh with the teeth of the input shaft.
It is used in every gear except direct, mostly 4th gear. If the bearings go, the teeth get out of proper alignment, and will wear funny, and make noise. The bearings can also make noise.
Was it ever run low on lube? Some transmissions are not able to handle the torque, and will start to fail, and this is the weakest point, IMO.
It will not cure itself, and will only get worse, and will only cost more to fix the longer it is run with a whine. If nothing else, make sure you have the lube up to the proper level.
tom
 
I have seen this issue with the front main bearing going bad and the reason it is quiet only in 4th is there is no side pressure from the counter shaft since it is in direct.
 
What is the shim tollerance? Thanks for the help guy's.
 
rangerguy351:What is the shim tollerance?

Are you asking about end-play tolerance? If so, which end-play? Or thickness tolerance allowed on the shim itself? In either case, you'd need shop manual information.
If this is the same transmission used in the 90 Mustang 5.0, I can find it on my shelf, but I don't know for sure what you are asking, and I'm too lazy to go down in the basement and find the list of tolerances until I know for sure if it is the same.
tom
 
The main-shaft "thrust washer" (that goes between the bearing race and the front bearing retainer is a "select fit" spacer that is made in incremental thicknesses.

I usually set them up with 0.002" "crush" because unlike the factory engineers
I understand that when the trans comes up to operating temperature the ALMINUM CASE
will grow more from thermal expansion than the STEEL gears and shafts inside the transmission....

You measure the pocket for the shim in the front bearing retainer and the height of the bearing as it sticks out the front of the case.

Factory spec is UP TO 0.004 clearance.

But at this point I'll bring up another issue that was pointed out by a bearing engineer at Timken (Who I'll admit knows more about this than I do) who stated that tapered roller bearings don't "like" being run with any "play" so it's always best to run them with a little extra load than ever allow them to be unloaded in operation, so you set them with "Pre-load" to prevent them from ever being run "loose"

The idea here is it's better to find a used bearing that's turned blue or brown than one that has started to spall off pieces...

The other spacer ring inside the front bearing retainer (for the counter-shaft bearing) is also a "selective fit spacer" that is available from ford in incremental thicknesses... BUT the counter-shaft bearings are "straight rollers" so you shim just to close up the gap.
this prevents the countershaft from alternately shifting fore and aft with a "Clunk"

These spacers and all the thicknesses available are listed in the factory service manual along with the ford part numbers for them
 
Last edited:
time: the input shaft shimming for the thrust bearing. I'm unsure of any other shimming that will be needed.
 
Allan D : thank you for the reply and your thought's on the shimming you recommend. I can also understand where the crush would come in to play so when it's warmed up it is in running tollerance. I think I also will do this.
 

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