DIVERSIFIED MACHINE INC. 2020 PRODUCT GUIDE
Driveline Frequently Asked Questions
Q What is the best U-Joint for me?
A It really depends on the class. Our all aluminum U-Joints are used successfully in all classes.
Steel vs. aluminum yokes is just a personal preference.
Q How many races can I use my U-Joint assembly?
A With 410, 360 and midgets we recommend replacing U-Joint assemblies every engine
freshen. 305's should not exceed fifty races with their assemblies. Our recommendations
apply to all U-Joint assemblies.
Q How does the non-greasable crosses work?
A Excellent. We began using them in 2002. They offer many advantages. They are maintenance
free. They keep the grease where it belongs. The cross is so well sealed the grease remains
in the cross. The solid forged cross features much more strength than the cast hollow joints.
Q What is the best driveline grease?
A On the torque ball assembly a #2 high temp works well. Also 20-50 motor oil works well and
doesn't attract as much grease. On the splines of the Driveshaft we recommend the DMI
Swivel Coupler Lube (Part # DMI-SWILUBE). DO NOT USE NEVER-SEIZE.
Q How many races should I run on my driveshaft?
A Driveshafts should be replaced every thirty races under normal racing conditions. We
recommend checking the driveshaft run out every five races. Run out should be less than
.003”. In the event of a violent crash or catastrophic engine failure the driveshaft should be
replaced immediately.
Q How critical is driveshaft length?
A Driveshaft length is extremely critical. We have seen as little as .250” be a contributing factor
in driveline and u-joint failures. Close is not going to get it done when cutting a driveshaft.
Measure twice and cut once!! Do not think that a driveshaft cut for a 40” car will be ok to try in
a 40.5” car. YOU WILL HAVE PROBLEMS!!!
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