clydefrog
NAXJA Forum User
- Location
- Northern California
At what driveline RPM's do vibrations become difficult to completey eliminate?
What I want to know is if I am chasing something that is at it's designed limit. I get driveline vibrations at ~2,500 to 2,600 DRIVELINE RPM's. This is at about 77 to 80mph. I didn't have an issue before but now since I regeared (4.56 with 33" tires) it's annoying. I usually cruise at 65-70mph so it's not really an issue then but I regularly use the rig for trans-State trips. Going through Nevada desert I regularly see 80mph for hours on end. If I go slower then the semi trucks will be passing me. I am at 4.5 inches of lift, the vibrations are coming from the rear shaft which is a custom built double carden unit with a slip yoke eliminator on the NP231 running an 8.8 with perfect rear u joint angle (perfectly straight pinion angle in relation to the driveline). The engine and trans is angled down quite drastically similar to a t-case lowering kit. Should I send the driveline in for rebalance or is that pretty much as fast as it will spin before vibrating? If I could get a shaft that does 3,000 RPM's smoothly I would be in great shape, is that even possible? I guess I should post up some pics of the angles I'm dealing with.
Any ideas would be much appreciated, I couldn't find anything on driveline designed limits for a double carden unit. Thanks.
What I want to know is if I am chasing something that is at it's designed limit. I get driveline vibrations at ~2,500 to 2,600 DRIVELINE RPM's. This is at about 77 to 80mph. I didn't have an issue before but now since I regeared (4.56 with 33" tires) it's annoying. I usually cruise at 65-70mph so it's not really an issue then but I regularly use the rig for trans-State trips. Going through Nevada desert I regularly see 80mph for hours on end. If I go slower then the semi trucks will be passing me. I am at 4.5 inches of lift, the vibrations are coming from the rear shaft which is a custom built double carden unit with a slip yoke eliminator on the NP231 running an 8.8 with perfect rear u joint angle (perfectly straight pinion angle in relation to the driveline). The engine and trans is angled down quite drastically similar to a t-case lowering kit. Should I send the driveline in for rebalance or is that pretty much as fast as it will spin before vibrating? If I could get a shaft that does 3,000 RPM's smoothly I would be in great shape, is that even possible? I guess I should post up some pics of the angles I'm dealing with.
Any ideas would be much appreciated, I couldn't find anything on driveline designed limits for a double carden unit. Thanks.