2G Center diff options

[mitsumike0]

Alright guys so here's the story. The car is a 97 GSX with an Evo 3 16g at 19psi , 272 cams and all the supporting mods. The clutch is slipping very bad so in a couple of weeks, off she goes to get fixed. While the Trans is out, I'm having the shop take a look at the Trans to see if anything looks out of line and do any potential upgrades while I'm there. What should I do with the center diff? Will it hold or should I dish out money for a 4 spider. My end power goals on the car are only around 350whp. The car will see maybe one drag race event a year with me driving the car 150 miles a week to work. Any thoughts on what route I should take?

 

[bastarddsm]

Do the upper torrington bearing and replace the gears/cross shaft if it's galled.

 

[mitsumike0]

Definitely wanted to do the Torrington upgrade. 4 spider is not necessary or would it just add comfort level for the future?

 

[twicks69]

If the condition of the cross-shaft and the pinion gearset are in good shape, and the housing does not have galling or wear damage where the thrust washers sit for the spider gears, then just install new lower pinion oiling washer, new spider gear washers, and get the center diff cover machined (if in good shape and not damaged from a worn out upper pinion washer), or if the cover is damaged, you will likely need a new pinion gearset and cover, and at a minimum machine the cover for the torrington bearing and thrust washer. If the cross-shaft is galled, then it probably galled the spider gear bores.

For the power levels, the 4-spider isn't necessary, but it will simply come down to the condition of all the parts to see what is warranted for repairs or modification or upgrading.

 

[pksystems]

I noticed vividracing.com says they have kaaz dbm2020 available. I doubt they actually have stock tho.

 

[mitsumike0]

If the condition of the cross-shaft and the pinion gearset are in good shape, and the housing does not have galling or wear damage where the thrust washers sit for the spider gears, then just install new lower pinion oiling washer, new spider gear washers, and get the center diff cover machined (if in good shape and not damaged from a worn out upper pinion washer), or if the cover is damaged, you will likely need a new pinion gearset and cover, and at a minimum machine the cover for the torrington bearing and thrust washer. If the cross-shaft is galled, then it probably galled the spider gear bores.

For the power levels, the 4-spider isn't necessary, but it will simply come down to the condition of all the parts to see what is warranted for repairs or modification or upgrading.

The master has spoken haha. But like you said, it will have to be torn down and inspected first, then a decision can be made. Any other popular bearing upgrades or oil upgrades that will be beneficial I should know about?

 

[bastarddsm]

I like to weld the scoops on the CD housing. It force-feeds oil into a very oil starved place.

 

[mitsumike0]

Good info bastard. If all looks good maybe a 4 spider isn't needed. Thanks all for the quick and great responses

 

[bastarddsm]

I have a 2 spider with a welded vcu on my car right now. It's lived through 3 transfercases, yoke, 2 axles, a ring and pinion, and a carrier. They hold up much better than anyone would ever dream. I think that a 4 spider is a waste. They would be a real improvement if they were made to use needle roller bearings on the cross shaft and in place of the thrust washer.