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5-speed Transmission counter shaft bearing sizes


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I have two transmissions that I am trying to swap the bell housings on. They have different size counter shaft bearings. The donor has a 62mm O.D. bearing. I would like to pull that off and put on a new bearing to match the bell housing I need which has a 56mm O.D. bearing. The problem is I don't know what the car the 56mm transmission came from and I cannot for the life of me find a car on rock auto which shows this size bearing. Lots of other common sizes, just not 56mm (2.20in) Anyone know the year break down of bearing sizes.
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The 71-B changed from the 56mm to the 62mm counter shaft bearing after '84. The 71-B was retired in '86.5. This narrows the ID to a 720 gas or diesel engine or the '85-'86.5 S12 with CA20 or CA18ET.

 

If swapping an L series 71-B front case, just pull the 62mm off and hammer a 56mm on. I would advise a NEW 56mm bearing as they do take a beating and one of the reasons for switching to the larger 62mm bearing. Use the 71-B cover plate. As for shims, you should really make some measurements while the cover plate is off. The counter bearing will stick out very slightly from the front of the transmission case. Measure this amount (how much it sticks out) and select shims that are just slightly thinner. (about 0.010" thinner) This allows the cover plate to just barely push against the counter shaft bearing and support it. Too tight is not good and too loose will allow the counter shaft to move forward and back.

 

It's possible that the first/second shift rod is a larger diameter (16mm) than the hole in the 71-B case. Just drill it out.

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Deleting the gasket behind the cover plate is a trick used to tighten things up. You need to test fit it this way before final assembly to make sure the bearings don't get too tight.

 

The main benefit behind this mod is a shortening of the shift throws, or more accurately, a more positive stop of the shift throws. It's an old racing mod to keep the shift collar from getting jammed on the gear during hard shifts.

 

If you don't want to delete the gasket, but do want to shorten the shift stops, you can weld a bump into the cavity where the shift rods contact and grind the bump to fit. You'll hear a slight clunk in the cover when the rods hit. Don't overdo it, or it will pop out of gear.

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Damn you guys are good. Yes it is the 56mm bearing shown in Crash's diagram. 
Even looking at the cars specified by DatzenMike, all of the listings either have no bearing O.D. shown or have an O.D. of 2.44 or 1.85.
I think I'll just go the Wayno route and measure it up and order to fit.
 

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71B counter bearing

 

32219-E9000... 56mm  used till about Sept '84 on the 720 and May in the S112

32219-V5201... 62mm used from Oct. '84 on the 720 and June '84 on in the S12 (also used on the '84 Maxima for the last production month)

 

 

 

71C counter bearing

 

32219-V5201.... 62mm used on the

'86.5 and up 4 cylinder D21 Hardbody,

'87 4 cylinder Pathfinder

'84-'89  non turbo Z31 300zx but not the Z32

Vanette.

240sx

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Yes it pre-loads the bearing. If the bearing sits 0.100" out from the case, the selected shims from a chart, around it should total 0.090". This allows the cover plate to press against the bearing by 0.010". 

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I guess I should chose my words more carefully.

 

I should have said that if you leave the washer out of the assembly, the bearing can dig into the front cover. Probably from harmonic vibration. I've seen it happen before, on both the aluminum covers and on the cast iron covers. The washer helps protect the cover from such wear.

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I don't think the gasket is available anymore.

Front cover gasket? The kits come with a rather thick cork gasket. 71C gaskets are still available from Nissan. I just sealed mine with RTV (not orange) and left the shim out because it prevented the cover from sitting flat.

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