# GEM Car Motor swap

**URL:** <https://community.electricforum.com/t/gem-car-motor-swap/13242>\
**Category:** GEM Forum\
**Created:** [January 19, 2018, 11:46pm UTC](https://community.electricforum.com/t/gem-car-motor-swap/13242 "2018-01-19T23:46:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![DJB](https://avatars.discourse-cdn.com/v4/letter/d/b782af/32.png) [@DJB](https://community.electricforum.com/u/DJB)\
**Post date:** [January 19, 2018, 11:46pm UTC](https://community.electricforum.com/t/gem-car-motor-swap/13242/1 "2018-01-19T23:46:47Z")

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I purchased a new DD Motors 7.5 HP motor from Monster Carts in Costa Mesa, CA. I did the installation myself. Was told to use the old bumper inside the 19 tooth Dana spline and to make sure it wouldn’t be to thick with the new motor. I measured the depth of the  
old and the new spline, before I installed the new motor. The old  
spline measures 7/8" deep and the new one 1" deep. I used the same bumper I took  
out, even though the depth of the new spline was deeper. I figured it was better if the  
armature end play were a little loose that tight.  
Now, I hear a “clunk” sound when I accelerate and decelerate. Most likely from the armature end play.  
Will this be a problem or should I pull the motor and add a thicker  
bumper? I am really not looking forward to pulling the motor out  
again.

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**Author:** ![eSGEMColo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/esgemcolo/32/714_2.png) [@eSGEMColo](https://community.electricforum.com/u/eSGEMColo)\
**Post date:** [January 21, 2018, 7:31pm UTC](https://community.electricforum.com/t/gem-car-motor-swap/13242/2 "2018-01-21T19:31:28Z")

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hi… I don’t have an answer… I bought my motor from another place and went to the list of aftermarket items… followed the suggestion and picked up a new bumper at a golf cart place… call D&D at 315-701-0635… they are good guys and quick to answer questions…

Bob