BMR BK049 Bushing Kit, Differential, Polyurethane

[whatsup62]

I am going to be dropping the entire rear center out to replace with a different differential. I was thinking it would be a good time to upgrade the bushings. Is anyone just running these without any other suspension mods? What is the feedback?

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[BMR Tech]

I'm at the airport, or would say call.

I do not suggest the BK049 for many people to be honest with you.

If NVH is not a concern, do the BK050. If NVH is a concern do the BK051 with the RH017 upgrade kit.

I have extensive testing with all of the available diff solutions on the market and can go into further detail if you need, but rest assured that I'm making a good suggestion.

I use the BK051 in my Daily driver and the BK050 in my racecar.

Hope that helps.

 

[whatsup62]

I'm at the airport, or would say call.

I do not suggest the BK049 for many people to be honest with you.

If NVH is not a concern, do the BK050. If NVH is a concern do the BK051 with the RH017 upgrade kit.

I have extensive testing with all of the available diff solutions on the market and can go into further detail if you need, but rest assured that I'm making a good suggestion.

I use the BK051 in my Daily driver and the BK050 in my racecar.

Hope that helps.

Got the 51's and bolt kit coming/ I have Steeda subframe connectors on the car...ok to keep on or do they need to go? Currently no wheel hop issues at all.

 

[DennisP]

I used the BK051 (without the upgraded bolts) and I have differential whine from about 55-62mph in the form of a continuous low whistle when I'm on the throttle.

It can get annoying, but I don't usually stay at that speed range for very long unless I'm in traffic. (too fast for neighborhood driving and too slow for freeway driving). I also had the BMR cradle lockout installed along with the Steeda dowels, so it could also have something to do with the dowels "resonating" at certain frequencies, but it's impossible to figure that out unless I pull the diff lockouts and test, then pull the dowels at test...not going to happen for the time being; too much work.

I'm just throwing it out there that yes, you can end up with NVH with even the "mildest" of these parts.

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