Torsen LSD for Carol's 1990 Pickup |
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(42 BIG pics loading) |
OCT 21 2020 |
Yes....I procrastinated this write-up for 2 years and 2 weeks :) Carol chose an interesting packing material to send the 3rd plus parts... But all these clothes did the trick. Made the long trip from NY to AZ just fine. |
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Long story short...the diff was a 3.42 ratio. Won't accept 390 gears. I found an old 410 8 cyl 3rd to do the job so all is good. |
I believe the 8 inch Torsen is rated for up to 1000 horse power so all is good there. |
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New races installed..... |
The Richmond brand 390 ring gear is checked for any unusual rough spots and all is good. |
Red loctite and 70 ft/lb. |
Richmond gears usually have a very wide .010" backlash like this one. |
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1.520" pinion head means a "4 cyl ring and pinion"....No loss in strength compared to a "V6 ring and pinion" but this can affect what thickness of pinion shim is used. example---.076" vs .237" |
.093 is the chosen starter shim. |
The pinion head was contacting the Torsen so a flapper wheel fixed it. |
Thread engagement is much less than on the right side. At least it's good to know that the most of the straining forces are also on the right. |
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1st paint test...DRIVE.....looks a little shallow. |
COAST.....could be shallow. |
Comet tail....hugging the root hard and that means it is shallow. |
Teardown and add .010" |
The little 12 ton from Harborfreight is easily up to this job....and hundreds of other similar jobs in recent years. |
mounting the pinion..... |
Now this is much better. This is the DRIVE side and is no longer shallow. |
COAST nice |
Reverse painted DRIVE.....nice. |
Reverse painted COAST....good. |
comet tail does not say much this time. |
With depth set now to set the solid collar. On the 3rd try, I nailed it. |
I now prefer only Genuine factory seals. All my leak reports went to zero after using factory part numbers. |
Recessed between 1.5~2.0 mm. |
Flange is wet sanded with #1500 sandpaper. A generous amount of anti-seize on the threads. |
New flange nut..... |
Tighten and measure a smooth 10 inch/pounds of pinion bearing preload. |
A final check and tighten the 4 bearing cap bolts to 70 ft/lb. |
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Heavy duty bubble wrap and packing paper to keep it from shifting around. |
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59 pounds heading to East NY. |
Notes of the install. |