Is this normal backlash on rear wheels

Road_Runna · May 15, 2011

I just finished doing a Differential trak lok install. I reused my old S spring because the new one that was supplied is impossible to install, heck I even had problems reinstalling the old one.

I checked backlash on the big gear once I installed everything except the diff cover, I used a dial indicator and came up with 12 thousanths of an inch (.012) backlash.

I took my digi cam, and recorded the backlash I get when the rims are installed and bolts tightened. Automatic trans, and car is in the Park mode, is this normal?

MVI_1674.mp4 video by car_sand - Photobucket

RIO5.0 · May 15, 2011

sounds normal to me.... last one I did appeared to have excessive backlash, same as yours is doing, and it was within spec. Long as the backlash at the carrier is .012 I'd say your fine.

ratio411 · May 15, 2011

I just did a gear and the 8.8" calls for .011" to .016" backlash.

ratio411 · May 15, 2011

I couldn't get my dial indicator square enough for my liking to a gear tooth, so I checked it at the flat side of one of the ring gear bolt heads.

Road_Runna · May 21, 2011

This question dawned on me last night. What is the correct gear mode to measure backlash? (P) PARK or in (N) Neutral.

I rechecked backlash today, while in the PARK mode I got .008 thousanth's of an inch.
I din't mention on any of my posts, the clutch pak im installing is the Carbon Fiber pak by FRPP?

RIO5.0 · May 21, 2011

Always used neutral myself...

toyman · May 21, 2011

I don't think it matters. You want to measure the backlash without rotating the pinion and drive shaft don't you?

Road_Runna · May 22, 2011

toyman said:
I don't think it matters. You want to measure the backlash without rotating the pinion and drive shaft don't you?

That's what I thought.
I measured backlash again yesterday this time in the Neutral gear selection, I came up with .009, it's not that hard to overturn the pinion gear and easily get more backlash because of the turning of the wheels.

Road_Runna · May 23, 2011

I started the car this morning, and took it around the block.

I wasn't too happy witht the ammount of oil I put in the differential, so im going to add more saturday and start peeling the tires.

Also, I ran out of the Permatex thread sealant, and started using nylon tape sealant on the threads. Will that create a problem? I used the tape thread sealer (NYLON) on the pinion bolts, and cap bolts.

toyman · May 23, 2011

Road_Runna said:
I started the car this morning, and took it around the block.

I wasn't too happy witht the ammount of oil I put in the differential, so im going to add more saturday and start peeling the tires.

It only takes 3.75 pints and is filled to the bottom of the filler hole. Don't forget to add the friction modifer.

Also, I ran out of the Permatex thread sealant, and started using nylon tape sealant on the threads. Will that create a problem? I used the tape thread sealer (NYLON) on the pinion bolts, and cap bolts.

I assume you mean "Teflon" tape. Teflon tape may not seal the bolt threads. Teflon tape is best used on tapered threads such as NPT nipples and couplers. Was there a reason to use the tape on the pinion bolts and cap bolts. I don't believe that's a good idea when tightening bolts to a specified torque.

alleymad95GT · May 23, 2011

Actually, if my memory serves me correctly...

Teflon tape is not even technically a thread sealer...it is used to lubricate...

If you used it on bolts that were torqued, I doubt the torque spec is correct...

Road_Runna · May 24, 2011

Looks like i'll be re-torquing those bolts this weekend, I used a bottle of the XL-3 Ford friction modifier, along with pure synthetic.

ratio411 · May 25, 2011

Road_Runna said:
That's what I thought.
I measured backlash again yesterday this time in the Neutral gear selection, I came up with .009, it's not that hard to overturn the pinion gear and easily get more backlash because of the turning of the wheels.

You have to 'lock down' the pinion, so it can't move, then only move the ring gear when you check lash.

Is this normal backlash on rear wheels

Road_Runna

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Is this normal backlash on rear wheels

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