Throwout bearing LS2/Lakewood/NV4500?
03-02-2013, 06:16 PM
#1
Throwout bearing LS2/Lakewood/NV4500? Hey All,
Is there a list of throwout bearings by overall length? My setup should work with a 1.485" TOB, will a 1.410 (pn N1451) work? This would leave an extra 0.075" of space. I'm not sure if a slightly shorter TOB will negatively effect the setup. The bearing retainer dia is 1.373", so that's only GM stuff, right? The Novak link below lists a few bearings by length, but I don't think this is a complete list. I also thought about an McLeod adjustable TOB, but had trouble verifying dimensions. Summit vs Jegs vs McLeod had different overall length numbers for the same part #, 16505.
The reason I ask is I'm in the middle of a engine swap (LS2/hybrid NV4500/lakewood bellhousing) and need to get a throwout bearing. The one that came with the clutch kit is 1.25" and I think it needs either a 1.125" or 1.485", depending on which flywheel is used. I think I measured correctly, but I also need to take into account the adjustable pivot mount, which I read needs to be 4.75" off the block. Does that sound right?
Below is the background info and some measurements. I searched here and on the web, but the Frankenstein nature of the swap makes it difficult. I figured who ever was reading this might have more knowledge and would let me know if they saw any issues. Measurements were based on Novak adapters info found here: The Novak Guide to Clutches, Linkages & Bellhousings for Jeeps
Engine:
2005 GTO LS2 6.0
Purchased from flywheel forward
Transmission:
2003 Dodge 5.7 NV4500, code 52108129AE
29 spline output
switched to GM input shaft PN20018 5.61 ratio, 1.125"/10 spline
bearing retainer turned down to 1.373"
trans face to bearing retainer TOB land ≈1.0625
Bellhousing:
(Drilled to Dodge NV4500 pattern)
Lakewood 6.3125" face to face
Bore opened to 5.60 (dodge bearing retainer OD)
Lakewood block plate ≈0.145" thick
Lakewood 15501 Adjustable Clutch Fork Pivot Ball
Clutch fork ratio 2.17:1 (3" pivot in/6.5" pivot to linkage point,
6.5/3=2.1666)
Flywheels:
1. GTO 12554130N, ≈0.815" thick
2. Sachs NFW1050, ≈1.182" thick, got this thinking crank was ≈0.40" shorter. actual≈0.367" difference. Not sure on thickness of stock 4.8/6.0 flywheel, read 0.950" or 0.960"
Clutch:
Sachs K5552-03 Clutch Kit (1 1/8 x 10 spline)
CT1082 pilot bearing
Measurements w/ sachs flywheel
Block to PP fingers 4.0"
Measurements w/ PN12554130N flywheel
Block to PP fingers 3.64"
Throwout bearing measurement info from novak link above
1. Bearing retainer land to bellhousing face measurement: 6.3125-1.0625=5.25
2. Diaphragm fingers to block face measurement: w/12554130N=4.0,
w/NFW1050=3.64
3. Air gap desired: 0.125"
Result:
w/GTO 12554130N, 5.25" - 4" - 0.125" =1.125" overall length bearing retainer
required.
w/NFW1050, 5.25" - 3.64" - 0.125" =1.485" overall length bearing retainer
required.
Thanks for any help,
Chan
Is there a list of throwout bearings by overall length? My setup should work with a 1.485" TOB, will a 1.410 (pn N1451) work? This would leave an extra 0.075" of space. I'm not sure if a slightly shorter TOB will negatively effect the setup. The bearing retainer dia is 1.373", so that's only GM stuff, right? The Novak link below lists a few bearings by length, but I don't think this is a complete list. I also thought about an McLeod adjustable TOB, but had trouble verifying dimensions. Summit vs Jegs vs McLeod had different overall length numbers for the same part #, 16505.
The reason I ask is I'm in the middle of a engine swap (LS2/hybrid NV4500/lakewood bellhousing) and need to get a throwout bearing. The one that came with the clutch kit is 1.25" and I think it needs either a 1.125" or 1.485", depending on which flywheel is used. I think I measured correctly, but I also need to take into account the adjustable pivot mount, which I read needs to be 4.75" off the block. Does that sound right?
Below is the background info and some measurements. I searched here and on the web, but the Frankenstein nature of the swap makes it difficult. I figured who ever was reading this might have more knowledge and would let me know if they saw any issues. Measurements were based on Novak adapters info found here: The Novak Guide to Clutches, Linkages & Bellhousings for Jeeps
Engine:
2005 GTO LS2 6.0
Purchased from flywheel forward
Transmission:
2003 Dodge 5.7 NV4500, code 52108129AE
29 spline output
switched to GM input shaft PN20018 5.61 ratio, 1.125"/10 spline
bearing retainer turned down to 1.373"
trans face to bearing retainer TOB land ≈1.0625
Bellhousing:
(Drilled to Dodge NV4500 pattern)
Lakewood 6.3125" face to face
Bore opened to 5.60 (dodge bearing retainer OD)
Lakewood block plate ≈0.145" thick
Lakewood 15501 Adjustable Clutch Fork Pivot Ball
Clutch fork ratio 2.17:1 (3" pivot in/6.5" pivot to linkage point,
6.5/3=2.1666)
Flywheels:
1. GTO 12554130N, ≈0.815" thick
2. Sachs NFW1050, ≈1.182" thick, got this thinking crank was ≈0.40" shorter. actual≈0.367" difference. Not sure on thickness of stock 4.8/6.0 flywheel, read 0.950" or 0.960"
Clutch:
Sachs K5552-03 Clutch Kit (1 1/8 x 10 spline)
CT1082 pilot bearing
Measurements w/ sachs flywheel
Block to PP fingers 4.0"
Measurements w/ PN12554130N flywheel
Block to PP fingers 3.64"
Throwout bearing measurement info from novak link above
1. Bearing retainer land to bellhousing face measurement: 6.3125-1.0625=5.25
2. Diaphragm fingers to block face measurement: w/12554130N=4.0,
w/NFW1050=3.64
3. Air gap desired: 0.125"
Result:
w/GTO 12554130N, 5.25" - 4" - 0.125" =1.125" overall length bearing retainer
required.
w/NFW1050, 5.25" - 3.64" - 0.125" =1.485" overall length bearing retainer
required.
Thanks for any help,
Chan
