LS1-450

iTrader: (33)

Have about 150 miles & 7 heat cycles in the 3.90's I recently installed. Good enough? Seems to me that heat cycles would be the important factor here. Further, 150 miles aught to be enough to deplenish the phosphorus coating.

Comments please:

BanditTA

iTrader: (3)

Break in isn't as critical with just a gear swap, if you also swapped out bearings and races it's a lot more important to break them in. You're probably good to go.

Any odd noises from the Motive's? Last sent of Motive's I installed had machining issues and made noise, wasn't impressed at all. Took weeks of screwing around to figure out there were gear issues and not install issues. Motive replaced the gear set but that didn't take into account the complaining from the owner and our time screwing with them. I've installed richmonds, superiors, genuine gear, GM OEM and never had issues, the one set of Motive's turned me off for good.

therobman

iTrader: (39)

i came out of the parking lot of the shop sideways that was my break in

thesource

iTrader: (60)

Good luck with Motive Gears. Maybe its just my personal experience but their quality has gone to the ******* over the past several years. I refuse to sell them or install them any more.

NavdeepWS6

lol i was so tempted to do that

Ironxcross

iTrader: (8)

Had a bad experience with motive gears when I did my 9" swap. Very poor quality. Managed to sheer the drive side off the ring gear just cruising around.

LS1-450

iTrader: (33)

Thanks for the comments. Wow, not good to hear about all of the Motive problems. The gear pattern was right on & the tolerances were good. Haven't heard any odd noises. Guess I'll consider 'em broken in & hope that nothing develops.

Intercooler2

iTrader: (24)

Instructions I got with my center was do tight circles both directions. Nothing about driving for X miles. My Motives have about 400 miles on them I think and one track visit doing okay.

jmm98LS1

iTrader: (28)

I had a set of Motive 4.33's chew themselves up pretty bad. They were set up perfect and made no noise at all from the start, then all the sudden started making a ton of noise. Took it apart and found a ton of metal. Motive said they weren't broken in properly and wouldn't do anything about it. I drove ~200 easy miles and a dozen complete heat cycles before taking it to the track. They told me minimum of 500 easy street miles. Have a set of Richmonds out back now, will never buy anything else again.

Randy WS6

iTrader: (69)

I have the Motive Performance (+) light weight 4:30's, For three years and i have split three pos units in my 8.8-31 spline, and cant count how many clutch pack Ive busted ,So now i have a mini spool .and had a M6 with 6000 rpm clutch dumps, and now a 4l80 mvb auto 4400 stall and still have the same gears and still quit, The brake in period i did was from motive,drive 50 miles start and stopping and some highway miles with out cool down during the 50 miles brake in period. then park the car over night for a complete cool down, Then after that ive been giving it hell ever sense. But even with Motive or and brand gears, With the GM 7.5's , There to weak for our f-bodies and with any power adders we need bigger rear ends. When i had the stock rear in my car i broke about evey brand gear i could find and finally broke the axles, That when i built a 8.8. Ive been told by a respective rear end builder, that the 7.5 pinion & pinion shaft are to weak and can flex, coursing gear climbing under extreme loads and destroying the gears. Richmond gears and some others make there ring gear in a 7.625" wich makes the ring gear stronger but the pinion is still the same dia.

LS1-450

iTrader: (33)

Thanks guys. Rear end is a Ford 8.8 w/ true trac differential & (IRS). Car is an LSX Miata. Am gonna give it some more "break in" time & then hope for the best.

Randy WS6

iTrader: (69)

What spline axles do you have in your 8.8 ?

LS1-450

iTrader: (33)

28 Spline, 99-03 Cobra Housing. True-trac 28 spline replaced the Ford (Eaton) stock differential. Weak point was the CV axle (center shaft) itself. Axles have been replaces w/ the latest M5 material (better than chrome moly). CV joints are 93 T-bird type.

The one time I had a failure, it was the axle before upgrading to M5 material. The 28 spline end connected to the Differential is not a weak point when using IRS. As noted, it is the axle or center shaft between the CV joints that breaks.

LS1-450

iTrader: (33)

Alright, I now have 523 miles & 11 heat cycles. So, at least if something develops, the proper break in has been covered. Thanks again for the comments, guys.

crainholio

iTrader: (2)

Change the fluid first.

LS1-450

iTrader: (33)

Yah, I did. Just didn't mention it. Thanks for the reminder though.