|Brent's Toyota Drift Car Gets New 5.13 Gears In The 6.7" Differential|
|(55 BIG pics loading)|
|NOV 15 2018|
| Brent's 87 Corolla is using all 100 horses as he drifts around the corner here at the Musselman Honda circuit in Tucson.|
Lincoln Locker spool in the rear means 50 horses per wheel all the time.
|The 4AGE engine runs on Yamaha R1 carbs. Another popular place to drift is Wildhorse Pass up in Chandler AZ.|
| Brent did a drive-by and brought over the 6.7" with all the good stuff. His diff was very noisey and upon removal|
this tooth was gone.
|No surprise this tooth went bye-bye after you read farther down ;)|
|The pinion flange had about 20 or 30 thou of in/out movement.|
| The pinion nut is so far down on the pinion threads that there is almost no groove for the dinged nut to grab onto.|
Wonder what is causing that.
| So if you have a 6.7 or a 7.5"....or even an 8" diff then you can get the bearings, seals and solid collars from Spence at |
| Here's the bearings and seal....carrier bearings on left...big pinion bearing and seal in middle....|
small outer pinion bearing on right.
|New 5.13 gears and parts organized. The gears came from Weir, too.|
| Lincoln locker. Spools are not available yet for the 6.7....gotta do what you gotta do. |
Whoever did this did a very nice job of MIG welding it.
|Pre-checking the feel before this teardown begins....still a little bit of carrier bearing preload left.|
|This is that up/down travel that is a killer of ring and pinons.|
|Drop the old 513 ring gear.|
|New carrier bearings will be tapped on.|
|Here's a close-up of that MIG weld job. As far as the quantity of welding material....this guy did not hold back.|
|Overall, a much better job than I have ever seen on other welded center carriers.|
| Still, that must have been alot of heat moving around so a quick run-out test showed that all was still in spec. |
Only saw .0015" runout max.
|Surfaces were tested with a big flat file and all was good.|
|Red Loctite will be used on the 8 ring gear bolts.|
|70 ft/lb of torque.|
|Now let's move onto the outer bare diff shell...|
|Bang the old pinion out/remove the seal and old races.|
| Reason #1 for all the gear noise and broken tooth.....No pinion shim. Zero. And no hidden shim behind the |
inner race. That would also explain why the pinion nut seated down too far.
|New BIG inner race is tapped in.|
|Small outer race is also tapped in.|
|Now onto the pinion portion. The first attempt with 078 resulted in a very shallow yellow painted pattern.|
|Teardown and now trying 094.|
|Drive......much better but still shallow.|
|Pinion tooth....you can see the lower comet tail is strongly tucked into the tooth root.|
|Teardown and re-shim to .102|
|.102....... beautiful! Good depth and even favoring the toe end some. Nice.|
|Reverse painted Drive.|
|Reverse painted coast.|
|Now see where the comet tail is? It moved out of the root and almost to center. Ideal.|
| With pinion depth established, now to get the high quality Weir solid collar shimmed correctly. |
The same solid collar and .045" shim from the previous job was used again....
and resulted in the exact same sloppy in/out movement as before.
.023" was removed from the original .045" and this now resulted in a nice smooth 10 in/lb preload.
That's .023" of in/out slop that it used to have and that is reason #2 for the noise and breakage.
|Love how Toyota auto dabs the clear grease on.|
|Seal is carefully tapped down in a level fashion until it is recessed about .170" all the way around.|
|Flange seal surface has been wet sanded with #1500.|
|150 ft/lb on the small pinion nut. These small nuts will strip out at about 200 ft/lb.|
|Lots of gear oil was on both bearings and a nice, smooth 10 in/lb of measured preload.|
|Nut is not threaded as deep as before. Ding!! and this end is complete.|
|Now fine tuning the backlash and bearing preload.|
|Tab locks are on and tightened to 10 ft/lb.|
|It doesn't get too much better than this.|
|Brent now uses Amsoil Severe Gear 75W-90 for best possible lubrication and reduced temps..|
|Notes taken during the setup.|