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Thanks for asking Johnny, gear set and new bearing kit really made things quiet.

Happy I stuck with the 3:55 ratio. Driving the car 55mph I'm running 2500rpm. Can't imagine it any higher than that for around town. No doubt the 3:73 would of been too much for what I'm trying to do. Thanks for advice to all who gave their 2c :glasses7:

My gears had a stamping on them.

Not really sure how Summit overnights stuff (free shipping).. but hey I'll take it!

Oh that thought has already crossed my mind.. just found someone selling new posi's for $380..? http://www.ebay.com/itm/Chrysler-8-3-4-8-75-Sure-Grip-Power-Lock-Posi-Unit-30-Spline-Mopar-NEW-/370892393392?pt=Motors_Car_Truck_Parts_Accessories&hash=item565ae8cbb0&vxp=mtr

Ended up buying a new set of Motive 3:55 gears and bearing kit. This is the first time I've pulled a chunk from a 8.75. Now I get why they so niiiice:cheers:

the lash was properly set by the gear shop before installing. when inspecting the gears they brought the visible wear n tear on the big gear to my attention.

Didn't realize Motive was that good. I saw the price on Summit and wondered how good the quality was. Thanks again.. http://www.summitracing.com/parts/mgr-c887355m

I appreciate that advice. Not sure how much more of a gain I'd get around town with 3:73 but if it got annoying at highway speeds I'd be stuck. Maybe 3:55 is the best all around gear.

Gear shop set the backlash when they put the rear end together.

When I go with the new gears your welcomed to the 3:55. Throw me an offer and they are yours!

Yeah I tried that calculator and the numbers didn't seem right at all..

My tire size is 26.6, would 3:73 be too much?

Its mainly a street car. Before installing the rear end I had the gear shop tear it down and they warned me the gears were shot but I didn't have the money at the time to swap em out. A few months later, rear end in, it howls. So I'm for certain its a bad set of gears. The gear shop is...

curious to know who's running what. i recently upgraded my 7.25 to a 8.75 that has 3:55 ratio in it. I've run the car a few times and it howls like a banshee (not in a good way). The gear shop suggested running a 3:73 ratio for some more bite. Curious to know if anyone has run that...

Well guys, I hate to admit it but I had the engine mounts in wrong. They were on the opposite sides of where they needed to be. Does anyone know an easy way of posting pics on these here forums? Thanks!!!

When you say buiscut do you mean how it looks like a little sandwhich? If so thats what the new tranny mount looks like as well. So in essence all 3 look the same. I'm wondering if spool style will give me that inch advantage that I need..

Thanks for responding. The 73 Swinger was originally a /6 car. When I bought it there was no engine/trans or driveshaft installed. So far I installed the entire K member, 318 and tranny from the 72 Valiant. Other than this trans mount issue I had minor threat with the pitman arm fitting...

To anyone reading who might be able to help. I'm using an engine + 904 tranny out of a 72 Valiant and installing into a 73 Swinger. Just about everything fits but the rear crossmember that hold up the tranny. Seems like there's about an inch difference. Does anyone know if they changed...