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Thread: 3.55 Gear Swap

  1. #1
    cfan's Avatar
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    Default 3.55 Gear Swap

    Hello Challenger fans, awhile back I bought a spare differential to put the new richmond 3.55 ring and pinion in.....after a long and educational experience...I got it put together. WARNING !!!! IF YOU DAMAGE THE PINION BEARING taking it off the original pinion....YOU CAN NOT GET A NEW ONE-----PERIOD! Since Dodge owes Mercedes some money...due to the Bankruptcy...there is a LOCK OUT on the sale of that bearing. Oh there is a number on that bearing...you just can't get it.....Dodge can't get it for you. The good news is there is a bearing that is reeeeal close..but machining to the pinion and diff housing is required.It's a great swap for performance...just prepare yourself for the extra work

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    sounds like that was a lot of fun! Glad it worked out in the end. I'm assuming you have the auto so 3.55 is a larger number/shorter gear?

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    Thor, You're correct..I have the auto. Some guys think putting in the getrag 3.73 or 3.91 from the 6speed cars would be good...WRONG...the 6speed has a 3.00 first gear..the auto has a 3.58 first gear which would make the 3.91's act like a 5.13 axle. The 3.23 would probably be the best all around gear for the auto so I'm going to build that rear end next

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    Hey Challenger fans, I finally got the rearend installed....I've only put 130 miles on it so far. I've noticed quicker shift points and an increase of 500 rpm at cruising speed(75).So far I like it. At the end of this month is the last race of the year....I'll let you know the gain in ET.

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    Default 6 Tenths---3.55 gear

    Well the racing season is over and the 09 5.7 Hemi gained 1.2 seconds under stock ET in the quarter mile---6 tenths came from the gear swap. The car drives better in all aspects but you do lose 4-5 miles per gal. It's worth it to me..

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    Congratulations, knocking off 1.2 from the ET in one season of racing is very nice. Good to see you are putting the car to good use

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    Thanks Thor, I'm deffinently happy with the mods. The parts totaled about 2500 dollars w/gear and all other bolt ons....the cars engine and drivability is improved with no ill effects,codes, or loss of comfort. At the track they see the R/T badge and it suprises alot of SRT's,SS's & GT's.....after all..everyone knows (according to Motor Trend,Hot Rod,Speed TV) the 5.7 auto is a dog

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    I just swapped mine out for a 3.64 on my SXT, should have better takeoff now for luanches, this matched with heads and cam install, the lil V6 will go.
    disappointed.... bought a lemon and all Chrysler did was hand me the strainer to make lemon aid.

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