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I decided to go with a 4:33. I had a Center section from RPM transmissions ($2,000.00) with the 3:70. It was loud and got worse. Sent it back for warranty repair and they replaced it, under warranty, and it was quite and worked great. Put in Ram clutch (bad idea for drag racing launch) and broke in clutch and gear for 500 miles. First time at the track I broke the posi with 4 or 5 wheel hops. Could have been bad already but I think the differential bushings from pfadt contributed. Stick with stock bushings they absorb vibration. I now have the new BMR bushings and put in an bigger bolt to take up all of the slack. I strongly recommend this even for stock bushings. Also upgrade the drive shaft bolts and loctite them.
Sent it back to RPM for warranty and they refused to honor the warranty listed on the website. I sent them a Jannetty posi upgrade kit and paid for new posi no labor. Told them to upgrade to 4:33 gear and they said extra $800.00. This was after they sent me pics of shredded parts and being told they did not recommend using old gear. Told them if it was noisy it was going back. It was super noisy in the driveway leaving Thunder racing.
After threats of litigation they finally agreed to send a new ADM 3:70 and install kit because I refused to send my center section back to them. They kept it a month the first time and month and half the second time.
I had Zimmer gears on choctaw in Baton Rouge install a 4:33 and they did an excellent job. They set it up really tight and they know what they are doing. They even called to ask if it was quiet and if I was satisfied. Their price was more than reasonable with a two day turn around.
So I have an extra 3:70. A couple of members have advised they will have the money after the holidays.
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