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Jeep Wrangler YJ
YJ General Discussion
Rear pinion angle, CV drive shaft length questions
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<blockquote data-quote="mvez" data-source="post: 436240" data-attributes="member: 20613"><p>I know some of these questions have been asked in other threads and other forums. I wanted to bring up my specific vehicle situation and see what the forum pros think. I'll do my best to not be too scatterbrained. </p><p></p><p>Shortly after I purchased my 95 YJ, manual, 4.0L, enough started going wrong with the transmission that I needed to have it rebuilt. one of the other things going on was that when letting off the clutch going to first from a stop, you would hear/feel stuff shacking underneath you and then see the shifter wiggly left to right until a little speed is picked up and clutch full engaged. It was bad. Here is a link to another forum thread that describes almost the exact same symptoms. I really felt that the transmission rebuild and SYE with CV DS would have fixed it. </p><p></p><p>[URL unfurl="true"]https://Jeep Forum/threads/yj-shakes-when-pulling-out-of-1st-gear.1381940/[/URL]</p><p></p><p>Let me explain what was on the jeep, what was removed, and what was added to combat the driveline issues I have been having. Then ill share my thoughts on what Id like to try, with some questions I could use help on. </p><p></p><p>At the time of purchase:</p><ul> <li data-xf-list-type="ul">Driveline all stock. </li> <li data-xf-list-type="ul">Suspension appears to be a 4.5" lift kit. 33"x12.5" tires, this includes a ~1.5" T-case drop and extended shackles (I believe they are 6.5" bushing center to center) I do not know the brand because the PO painted over just about EVERYTHING with black paint under the vehicle. Lucky me now gets paint chips in the face everytime I'm underneath. There is no body lift. </li> <li data-xf-list-type="ul">Track bars were still installed using provided brackets from lift kit. </li> </ul><p>Over the past year, the following has been done regarding the suspension and driveline. Mainly due to transmission failure and the vibrations I was feeling. </p><ul> <li data-xf-list-type="ul">new 33" tires.</li> <li data-xf-list-type="ul">transmission rebuild by a jeep specialty shop. While he was doing this I also had them install an SYE and CV driveshaft. The T-case drop was not removed</li> <li data-xf-list-type="ul">Engine and transmission mounts have been replaced</li> <li data-xf-list-type="ul">I've recently removed both track bars while getting these measurements. </li> </ul><p>After the SYE and new driveshaft, the shaking of the shift lever going into first is still there. It's not as aggressive but still aggressive unless you REALLYY let off the clutch slow. slow to get honked at when the light turns green. You also hear the exhaust clinking on the rear shackle since the exhaust hangers are a little loose. But I am assuming the shaking is coming from the rear, causing what i have been describing. I have not had a chance to visually see what happens. </p><p></p><p>Okay so here are some pictures of my current setup. The rear end is still on jack stands as I'd like to have this sorted by this weekend if possible. I have not driven the jeep yet with the track bars off and Im really curious to see the chiropractor(my jeep) is not as rough on the road anymore.</p><p>I was told the pinon angle relative to the axle was not perfect but good enough. I'm not convinced and want more opinions. </p><p>It visually looks like the rear pinon is angled UP more than the driveshaft is. I through a digital angle finder on it to confirm. about 3* degrees. <u>Can someone confirm i took these in the right spot?</u> I'll retake if needed but visually you can see the difference, <u>What should the correct angle be?</u></p><p></p><p>I feel like this would be a good place to start to help fix that vibration. I'm not convinced it cannot be fixed. </p><p></p><p>Here are my thoughts on having to tackle the angle change. before buying shims or shortening shackles to adjust rear pinion, I'd like to remove the T-case drop. I have an SYE, theoretically it should not be needed and this would bring the driveshaft angle UP and MAYBE pit it in line with the rear pinion. This brings up a question regarding the drive shaft. The CV driveshaft was ordered by the jeep shop to fit the current lift, SYE, and T-case drop combination. <u>If I remove the T-case drop, will this extend the CV driveshaft too much? How do I know if my current driveshaft will still work?</u> </p><p></p><p>I am starting here because id like to get rid of the t-case drop anyway. I will consider shorter shackles and shims if necessary but I don't want to waste money on this if I don't have to since I'm likely to completely replace ALL the old lift kit with a newer and better one. This was installed over 11 years ago. It still seems very solid, but maybe toooo solid. </p><p></p><p>I know it's not a car, it's a jeep. But this jeep could be smoother. </p><p></p><p>Thanks for any help that can be provided. I can get more photos as well if needed.</p><p></p><p>[ATTACH=full]120461[/ATTACH]</p><p></p><p>[ATTACH=full]120462[/ATTACH]</p><p></p><p>[ATTACH=full]120463[/ATTACH]</p><p></p><p>[ATTACH=full]120464[/ATTACH]</p><p></p><p>[ATTACH=full]120465[/ATTACH]</p><p></p><p>[ATTACH=full]120466[/ATTACH]</p><p></p><p>[ATTACH=full]120467[/ATTACH]</p><p></p><p>[ATTACH=full]120468[/ATTACH]</p></blockquote><p></p>
[QUOTE="mvez, post: 436240, member: 20613"] I know some of these questions have been asked in other threads and other forums. I wanted to bring up my specific vehicle situation and see what the forum pros think. I'll do my best to not be too scatterbrained. Shortly after I purchased my 95 YJ, manual, 4.0L, enough started going wrong with the transmission that I needed to have it rebuilt. one of the other things going on was that when letting off the clutch going to first from a stop, you would hear/feel stuff shacking underneath you and then see the shifter wiggly left to right until a little speed is picked up and clutch full engaged. It was bad. Here is a link to another forum thread that describes almost the exact same symptoms. I really felt that the transmission rebuild and SYE with CV DS would have fixed it. [URL unfurl="true"]https://Jeep Forum/threads/yj-shakes-when-pulling-out-of-1st-gear.1381940/[/URL] Let me explain what was on the jeep, what was removed, and what was added to combat the driveline issues I have been having. Then ill share my thoughts on what Id like to try, with some questions I could use help on. At the time of purchase: [LIST] [*]Driveline all stock. [*]Suspension appears to be a 4.5" lift kit. 33"x12.5" tires, this includes a ~1.5" T-case drop and extended shackles (I believe they are 6.5" bushing center to center) I do not know the brand because the PO painted over just about EVERYTHING with black paint under the vehicle. Lucky me now gets paint chips in the face everytime I'm underneath. There is no body lift. [*]Track bars were still installed using provided brackets from lift kit. [/LIST] Over the past year, the following has been done regarding the suspension and driveline. Mainly due to transmission failure and the vibrations I was feeling. [LIST] [*]new 33" tires. [*]transmission rebuild by a jeep specialty shop. While he was doing this I also had them install an SYE and CV driveshaft. The T-case drop was not removed [*]Engine and transmission mounts have been replaced [*]I've recently removed both track bars while getting these measurements. [/LIST] After the SYE and new driveshaft, the shaking of the shift lever going into first is still there. It's not as aggressive but still aggressive unless you REALLYY let off the clutch slow. slow to get honked at when the light turns green. You also hear the exhaust clinking on the rear shackle since the exhaust hangers are a little loose. But I am assuming the shaking is coming from the rear, causing what i have been describing. I have not had a chance to visually see what happens. Okay so here are some pictures of my current setup. The rear end is still on jack stands as I'd like to have this sorted by this weekend if possible. I have not driven the jeep yet with the track bars off and Im really curious to see the chiropractor(my jeep) is not as rough on the road anymore. I was told the pinon angle relative to the axle was not perfect but good enough. I'm not convinced and want more opinions. It visually looks like the rear pinon is angled UP more than the driveshaft is. I through a digital angle finder on it to confirm. about 3* degrees. [U]Can someone confirm i took these in the right spot?[/U] I'll retake if needed but visually you can see the difference, [U]What should the correct angle be?[/U] I feel like this would be a good place to start to help fix that vibration. I'm not convinced it cannot be fixed. Here are my thoughts on having to tackle the angle change. before buying shims or shortening shackles to adjust rear pinion, I'd like to remove the T-case drop. I have an SYE, theoretically it should not be needed and this would bring the driveshaft angle UP and MAYBE pit it in line with the rear pinion. This brings up a question regarding the drive shaft. The CV driveshaft was ordered by the jeep shop to fit the current lift, SYE, and T-case drop combination. [U]If I remove the T-case drop, will this extend the CV driveshaft too much? How do I know if my current driveshaft will still work?[/U] I am starting here because id like to get rid of the t-case drop anyway. I will consider shorter shackles and shims if necessary but I don't want to waste money on this if I don't have to since I'm likely to completely replace ALL the old lift kit with a newer and better one. This was installed over 11 years ago. It still seems very solid, but maybe toooo solid. I know it's not a car, it's a jeep. But this jeep could be smoother. Thanks for any help that can be provided. I can get more photos as well if needed. [ATTACH=full]120461[/ATTACH] [ATTACH=full]120462[/ATTACH] [ATTACH=full]120463[/ATTACH] [ATTACH=full]120464[/ATTACH] [ATTACH=full]120465[/ATTACH] [ATTACH=full]120466[/ATTACH] [ATTACH=full]120467[/ATTACH] [ATTACH=full]120468[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Rear pinion angle, CV drive shaft length questions
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