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PostPosted: Sun May 10, 2015 9:17 pm 
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Joined: Thu May 22, 2008 10:08 pm
Posts: 238
Location: Detroit, MI
Year and Trim: 1996 Bonneville S/SE
I plan on swapping the '96 over from the 4T60 to a 4T65 that I sourced from a '98 Bonneville SE. I would really like to convert this transmission over to the HD version and use 3.39 Overall Gear Ratio. However I have a couple of questions.

1. Are all HD diffs a 3.29 Ratio Diff?

2. Do I need to swap the ring gear in the non-hd 4t65 at the same time as I swap the diff? Which Ring gear would I need to source.

I plan on installing the 4T65 HD upgrade kit from ZZP and their 7/8 chain kit too. I am just trying to make sure I don't miss anything during the rebuild.


Thanks

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INFO FOR CONVERTING SE TO SSE BODY HERE=>>http://www.pontiacbonnevilleclub.com/forum/detailing-appearance/topic39372.html
http://www.pontiacbonnevilleclub.com/forum/performance-brainstorming/topic43633.html
2002 Pro Stock Pontiac Firebird**GM 399 Splayed Valve Engine
1996 Pontiac Bonneville SE/SSE **100% Transformation from SE to SSE Complete**Lowered 2.00inches too**


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PostPosted: Mon May 11, 2015 11:16 am 
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Certified Bonneville Nut
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4591
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
I can't recall exactly, but I thought you only need a ring gear change if you have a 4t60.

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The Fleet:
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'97 Camaro - Top swap
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'92 Trofeo - Fair weather DD
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PostPosted: Tue May 12, 2015 8:17 pm 
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Retired Admin/Techinfo Admin
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Joined: Mon May 19, 2008 2:08 pm
Posts: 26008
Location: Space Coast, or at least it used to be
Year and Trim: 03 SLE, 95 SE, 95 TS SE
Speedster400 wrote:
I plan on swapping the '96 over from the 4T60 to a 4T65 that I sourced from a '98 Bonneville SE. I would really like to convert this transmission over to the HD version and use 3.39 Overall Gear Ratio. However I have a couple of questions.

1. Are all HD diffs a 3.29 Ratio Diff?

2. Do I need to swap the ring gear in the non-hd 4t65 at the same time as I swap the diff? Which Ring gear would I need to source.

I plan on installing the 4T65 HD upgrade kit from ZZP and their 7/8 chain kit too. I am just trying to make sure I don't miss anything during the rebuild.


Thanks


If memory serves, a stock 2.86 ratio or 3.05 4T65E will have the 35 Drive and 35 Driven gears, The 4T65E HD uses a 37 Drive and 33 Driven for an overall 2.93 ratio( This is the 3.29 Diff )

If you use the 35 Drive and 35 Driven with the 3.29 HD Diff, HD diff cover and HD axle you will have an overall 3.29, I would get the ring gear just to have it, but iirc the ring gears between the 2.86, 3.05 and 3.29 should be the same.


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PostPosted: Wed May 13, 2015 12:15 am 
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Certified Bonneville Nut
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Joined: Mon May 10, 2010 6:11 pm
Posts: 9165
Location: Chicago, IL
Year and Trim: 2003 SLE
What exactly is in ZZP's upgrade kit? Be wary of them, they love to sell snake oil. The HD trans is in reality no stronger than the regular one.

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"Penelope" - 2003 SLE - 203k Miles
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PostPosted: Wed May 13, 2015 9:11 am 
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Posts like an L67
Posts like an L67

Joined: Fri Aug 01, 2008 11:57 am
Posts: 1382
Year and Trim: 2003 SSEi.

LOTS of Mods
to convert from a Non HD to a HD you need the following.

HD Diff (3.29 ratio they are all this way)
HD Diff Cover
Passenger Side SSEi axle
PCM Programming to accept the 3.29 ratio

I "think" the sun gear that is inside the Diff is a different size, and you will need a HD Diff Sun Gear


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PostPosted: Wed May 13, 2015 12:04 pm 
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Retired Admin/Techinfo Admin
Retired Admin/Techinfo Admin

Joined: Mon May 19, 2008 2:08 pm
Posts: 26008
Location: Space Coast, or at least it used to be
Year and Trim: 03 SLE, 95 SE, 95 TS SE
I should have said make sure that 3.29 HD diff has the sun gear..lol

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HD 3.29 on the left and Light Duty 3.05 on the right..


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