1966 Mustang 3rd member swap
Ok, so i called to see how the car was coming and the mechanic told me that everything was done but couldnt figure out some type of whine. He said he can hear it upon acceleratoin and deceleration at higher speeds around 55-65mph. I had him swap the 43 year old 3rd member with 2.80 open differential for a 3.25 Traction-Loc 3rd member from JustRearEnds.com. He said that because they are brand new and really tight that its why they might be making that sound (and something about the paint marks on the new gears?)and when it wears it might go away?
I had this done, because, A) i wanted a little more pep out of the car, and B) because at 45-50mph it would start to give out a high pitched whine. Completely silent before and after those speeds. So i figured i should have it replaced. Now i dont know whats going on. He said that he wasnt sure why it made that sound and for me to "take it for a drive and see what you think. It might not be that bad to you." (but any sound cant be good right?)
So i guess my question is, do these types of "performance" rear ends make noise like that? I hate to have just dumped over $1,200 in parts and labor for it to not be fixed and still have something go/be wrong. Its not like i dont trust the labor either. The guy knows his stuff. Hes been in business for over 25 years and all the guys from the hotrod club go to him (thats what made me try him at first). Hes built some really high end street machines. So i dont know, im hoping its normal and will go away but if any of you know what it is please let me know. Thanks.
1966 Mustang 2+2, 289 c code/c4, Edel 600cfm/performer carb, intake/spacer,Comp XE250H Cam, pertronix igintor w/ coil, tri-y headers, dual factory 2"exhaust w/ H-pipe, flex fan, UDP's, windage tray, Grab-a-track Suspension, B&M shift kit, 2.80 w/track lock diff.
'10 Toyota 4runner Trail- toytec 3" ultimate susp, 33" coopers, custom/trd intake, Bajaracks standard rack
'13 Lexus ES350 Ultimate Lux pkg- hydrocarbon filter removal mod/k&n filter.