Graziano Gearing and Drop Gears

#61
I've finished 4 SL-C's with the new gears. Engines have been the 525 hp LS, 1200 hp twin turbo LS and 2 LT4's. Also have a LS 525 without the drop gears.
The gearing feels great with shift points feeling very natural.
First gear is now usable without sacrificing the acceleration when needed.
I always thought that the Ricardo transaxle gearing was too high and the Graziano stock gears too low. The new gearing finds a great balance between the two.
Did any of the cases need to be modified forr the new 1.04 gearing
or is it true drop in?
 
#62
John B at HFC Autosport, what are the actual ratios of the V10 graziano (for drop gear calculating)?

06 and up Gallardo V10 and Audi V10
Effective........... Actual
1-4.37................. 1-3.311
2-2.71................. 2-2.053
3-1.93................. 3-1.462
4-1.50................. 4-1.136
5-1.24.................. 5-.939
6-1.04.................. 6-.788

transfer-1.32
Final drive-3.08
 
Last edited:

John B

Member
GT40s Sponsor
#65
Did any of the cases need to be modified forr the new 1.04 gearing
or is it true drop in?
Paul - the case needs a small amount of machining. We generally work with Ron McCall (McCall's Autoworks) on these. He's done about a dozen now - great feedback from customers.

John B at HFC Autosport, what are the actual ratios of the V10 graziano (for drop gear calculating)?

06 and up Gallardo V10 and Audi V10
Effective........... Actual
1-4.37................. 1-3.311
2-2.71................. 2-2.053
3-1.93................. 3-1.462
4-1.50................. 4-1.136
5-1.24.................. 5-.939
6-1.04.................. 6-.788

transfer-1.32
Final drive-3.08
Ken - those ratios are correct out to the thousanths. I'd use with confidence.
 

Johan

Member
GT40s Supporter
#66
FYI, I didn’t need any clearncing/grinding when installed into a KVJ (R8 V10) That was with the 1,04:1 gear
 

John B

Member
GT40s Sponsor
#68
Ken - Johan has our drop gears. Two sets, actually!

Johan - I'm a little concerned about your installer not clearancing the boss. There have been 15+ sets installed now, and all I'm aware of required some machining. It's a lot more with the .76's, but the 1.04's need some as well.
When you do the second set, will you please double check that area? My gut tells me the first one is going to have to come apart.
 

Johan

Member
GT40s Supporter
#69
Hi John,
I was totally prepared for some clearencing when we istalled your transfer gear, but as it turned out it was not nessesary.
After your post here I called my friend doing the gear change and he is as certain as I am it was not needed.
Just to be certain I went out to my garage and checked it. When turning the input shaft when in gear (1 through 6) there is no resistance nor any strange noice.
Can’t remember now, but I believe we had about 1-1,5mm clearance to the casing.

This is an older transaxle (KVJ) so I wonder if the casting is a little different?
This will also explain the recessed gear. (You said they changed around 2014)
 
Top