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#1 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Pinion angle on tranz
Anyone know how I can squeeze a couple more degrees of pinion angle on my tranz.. I have a gen 1 pb drop xmember and my pinion angle right now is 7* I was under the impression that as long as the pinion angle on the rear and was 180 opposite I'd be in good shape. But now after talking to expirienced builders I learned it should be 3* .... but I can't jack up my tranz with out putting stress on my motor mounts 7* was the most I could get out of it with out having the bushing squished on the motor mount. And just to get it at 7* I had to shave my steering rack down bc it was hitting my oil pan. And I had to roll the edge of my oil pan too. Any one ever hear of this? It's pb I wouldn't think I'd have this problem.
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#2 |
Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: Pinion angle on tranz
Your COMBINED crank / trans angle PLUS the PINION angle DIVIDED by TWO should be under 3 degrees for optimum performance.
Example- if the trans is 4 deg & pinion is 3 deg then 4 + 3 = 7 / 2 = 3.5 degrees. |
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#3 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
Just a pic to go along with the post
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#4 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: Pinion angle on tranz
Do you have the chassis set to the intended ride height?
These angles need to be measured as though it is a fully assembled vehicle with the full weight on the wheels. That could potentially "raise" the rear axle relative to the frame and flatten your driveshaft/trans tailshaft working angle out. K
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#5 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
Yea it's set up at ride height. Frame is level....
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#6 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Pinion angle on tranz
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#7 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
I bought the whole assy used I'm not 100% sure the motor mounts are the right ones bc my engine is on a wicked slant. I wish I had more for u... u have to Chang ur oil pan buy any chance ?
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#8 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Pinion angle on tranz
Stock stamped steel 5qt pan.
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#9 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
Pb recommends 5* tho huh I wonder if that goes for mine too? I was talking to pb about this problem via email but they left me hanging
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#10 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Pinion angle on tranz
Quote:
Porterbuilt might be more eloquent w/his explanation but here's my summary.... Extreme drops come w/the caveat of compromise. His standard method is the 5° angle & a 2pc driveline. Given that usually works well for most apps, I chose a different path but needed to better understand the 'Why' in his recommendation. I felt that going through the expense of a 2pc driveline & it still possibly being a greater than desired compromise would be a roll of the dice (I experienced this 1st hand in someone's truck). The fix? Adding in a Double Cardan/CV joint. I opted to do 3° & a 1pc driveline as it's more common w/hot-rod builds & is a standard. I could save money using the 1pc & avoid the added complexity. If there's an issue w/vibration, I can still swap to that same Double Cardan/CV joint. To me, the cost difference & 'dumbing things down' was worth cutting up some of the bottom of my cab.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#11 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
What's a cardon cv joint and it requires cutting up the cab? Drive line = drive shaft ?
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#12 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
I thought about heating the motor mounts up with the torch and jacking up the tranz. Or possibly pie cut them
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#13 |
Registered User
Join Date: Jul 2009
Location: San Jose Ca
Posts: 2,871
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Re: Pinion angle on tranz
Do you have better pictures of all the interference points? Granted I cant really see what you are working with but I would look at redoing the bottom tabs where the motor mount attaches to the cross member.
You could cut new tabs and raise the engine just enough to clear the rack at the same time as correcting the trans angle.
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#14 |
Registered User
Join Date: Sep 2010
Location: Lake Tahoe, Nevada
Posts: 755
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Re: Pinion angle on tranz
A double-cardan joint (also called a CV joint) can handle more angle than a universal joint, BUT operates a little different. With a double-cardan, you align the axle pinion directly inline with the driveline, you do NOT match the transmission angle.
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#15 |
Registered User
Join Date: Dec 2009
Location: El Dorado Ca
Posts: 3,374
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Re: Pinion angle on tranz
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#16 |
Registered User
Join Date: Mar 2010
Location: thomastown mississippi
Posts: 1,261
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Re: Pinion angle on tranz
This is what we went with on our K5 Blazer w/ 4" lift. NO vibes!
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#17 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
I don't don't know about doing a cv joint I just wanna get my tranz angle to 3*
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#18 |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Pinion angle on tranz
How low are you going? You may need to know & understand the parts. I never had issues w/my other trucks (other than the differential hitting the bed floor) & that was w/stock frame. Add a different/aftermarket front xmember + other alterations and especially if you run an OD trans..... it could be very necessary.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#19 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
It's gonna lay frame
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#20 |
Registered User
Join Date: Nov 2016
Location: Lunenburg Ma
Posts: 52
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Re: Pinion angle on tranz
What goes into changing to cv joint style drive shaft. What does it cost
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#21 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,964
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Re: Pinion angle on tranz
Quote:
When I priced a balanced 2pc set-up w/a poly/billet carrier bearing @ the same place it was about $650 (that was w/everything new as I never had any C10's w/a 2pc set-up to have used parts as my starting point).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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