NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   -   Backlash Of Rear Differential... (https://www.nopistons.com/2nd-generation-specific-17/backlash-rear-differential-43960/)

Cheers! 01-29-2005 09:52 PM

How much backlash is there suppose to be between the pinion flange and the half shafts. I have about 5 degrees of it.

j9fd3s 01-29-2005 10:23 PM

that seems about right.

banzaitoyota 01-29-2005 10:57 PM

Standard backlash is 0-0.1mm (0-0.004") maeasured with a mag base and a dial indicator. PER the FSM

HIMNI RACING 01-30-2005 09:21 AM

Yeah, I have a large amount of slop in mine too. Feels like crap. We just put a LSD in my friend's N/A yesterday and I couldn't feel any. If it was done with a dial indicator, I bet it would be in the 1mm range.





Now if I could only destroy my LSD, it'll force me to take the time to drop in a fresh one.

banzaitoyota 01-30-2005 10:42 AM

My newley rebuilt diff is being assembled as we speak. Should be interesting.

rfreeman27 01-30-2005 02:52 PM


Originally Posted by banzaitoyota' date='Jan 29 2005, 11:57 PM
Standard backlash is 0-0.1mm (0-0.004") maeasured with a mag base and a dial indicator. PER the FSM






I didnt have the FSM, so I called up my buddy that builds rear ends for domestic cars. He said anywhere between .006" and .008" was what he considered good. So i put it together at .007" and it is SLOPPY. When i get around to it, I will post pics of the ring gear and pinion, i hope they are not destroyed...

Cheers! 01-30-2005 03:04 PM


Originally Posted by banzaitoyota' date='Jan 29 2005, 11:57 PM
Standard backlash is 0-0.1mm (0-0.004") maeasured with a mag base and a dial indicator. PER the FSM




That is the spec if measure at the ring gear with a dial indicator. I'm talking about the pinion flange backlash without opening the diff.



Mike, if you think it's fine, i'm nto going to touch it, this is potentially opening up a can of worms

j9fd3s 01-30-2005 03:08 PM


Originally Posted by Cheers!' date='Jan 30 2005, 01:03 PM
That is spec when I ahve a dial indicator at the ring gear. I"m talking about at the pinion flange without opening the diff.



Mike, if you think it's fine, i'm nto going to touch it, this is potentially opening up a can of worms




yeah at the pinion flange its like hmm hard to put into words but there is maybe 1/8-1/4"

Cheers! 01-30-2005 04:16 PM

ok **** it... i'm not going to touch it. Going to finish off those delrin bushings and remount the damn thing. If it fucks up still I'll pay someone to fix it for me. I just want to move on from this never ending rear end dissaseembly and reassembly

l8t apex 02-01-2005 08:33 AM

too bad that on domestics you get the yellow paste and a wear in guide that allows for real fast setup. Rotate a couple times ,just match the pics and then check with dial.


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