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View Full Version : 4.10 Gears affect OD?


NavySeabee
03-16-2015, 03:52 PM
A mechanic I was talking to is under the impression changing to 4.10 gears will mess up the over drive. Anyone know what he's talking about?

Thanks.
Pete
RubberCtyRauder
03-16-2015, 03:55 PM
Only if you don't get a tune for the 4.10 gears, the trans will shift wonky as if it still has 3.55
NavySeabee
03-16-2015, 03:58 PM
Thats what I thought. I do have the Lidio tune for 4.10s. I didnt mention to him.
RubberCtyRauder
03-16-2015, 03:59 PM
get the tune and then install them so you can download it right in there when done.
fastblackmerc
03-16-2015, 04:25 PM
No tune = tranmission shifting problems

Tune = goodness!
NavySeabee
03-16-2015, 04:52 PM
No tune = tranmission shifting problems

Tune = goodness!

I'm good to go then. Thanks for the replies.
chief455
03-16-2015, 05:04 PM
No tune = tranmission shifting problems,
Speedometer reading inaccurate
Tune = goodness!
plus above^
RF Overlord
03-17-2015, 04:18 AM
Many "old-school" mechanics think 4.10 is some sort of mystical extreme ratio to be feared. They would be right if we were talking about my '68 Buick with a 3-speed auto, no O/D and 14" wheels. On a modern car with a 4-speed O/D, 18"wheels and an OHC engine, 4.10 is perfectly reasonable.
martyo
03-17-2015, 04:56 AM
Many "old-school" mechanics think 4.10 is some sort of mystical extreme ratio to be feared. They would be right if we were talking about my '68 Buick with a 3-speed auto, no O/D and 14" wheels. On a modern car with a 4-speed O/D, 18"wheels and an OHC engine, 4.10 is perfectly reasonable.

And for these reasons if your mechanic thinks the 4.10s are an issue for these cars, I suggest putting your Keds on and walking to the next shop.
Krytin
03-18-2015, 04:09 AM
And for these reasons if your mechanic thinks the 4.10s are an issue for these cars, I suggest putting your Keds on and walking to the next shop.


+1 on that^^^.
detrailers
03-19-2015, 07:23 AM
And for these reasons if your mechanic thinks the 4.10s are an issue for these cars, I suggest putting your Keds on and walking to the next shop.

LOL... Getting my parts together for my 4.10 upgrade.. Will be in touch soon for a revised tune.
NavySeabee
03-20-2015, 09:29 AM
Has anyone used this kit and was told different shims/extra needed to be ordered? It's only 40 bucks but I was under the impression EVERYTHING was included.

http://www.latemodelrestoration.com/item/LRS-4209FRC-K/Mustang-88-410-Ratio-Rear-End-Gear-Kit

3 yellow markings (dots/lines?) were mentioned on the shims he needed.
fastblackmerc
03-20-2015, 10:06 AM
Has anyone used this kit and was told different shims/extra needed to be ordered? It's only 40 bucks but I was under the impression EVERYTHING was included.

http://www.latemodelrestoration.com/item/LRS-4209FRC-K/Mustang-88-410-Ratio-Rear-End-Gear-Kit

3 yellow markings (dots/lines?) were mentioned on the shims he needed.

You can reuse the shims already installed, if needed.

You don't need the gasket, use RTV silicone instead.

You should use 70W140 fluid instead.
NavySeabee
03-20-2015, 10:11 AM
You can reuse the shims already installed, if needed.

You don't need the gasket, use RTV silicone instead.

You should use 70W140 fluid instead.

He said the shims already installed were slightly concave, does that make sense?.

I'll be using the fluid with the kit for the break-in. I have 3 bottles of 70W140 ready after that.

Thanks FBM!
fastblackmerc
03-20-2015, 10:14 AM
He said the shims already installed were slightly concave, does that make sense?.

I'll be using the fluid with the kit for the break-in. I have 3 bottles of 70W140 ready after that.

Thanks FBM!

If they are concave that's not good, they should be flat.
NavySeabee
03-20-2015, 10:16 AM
If they are concave that's not good, they should be flat.

Just making sure he's not picking my pockets! Thanks.
fastblackmerc
03-20-2015, 10:20 AM
I'd also replace the bearing cap bolts with studs ... like these:

http://www.ebay.com/itm/8-8-Ford-Dana-60-Main-Cap-Stud-Kit-/131457695427?pt=Motors_Car_Tru ck_Parts_Accessories&hash=item1e9b7d3ec3&vxp=mtr

Also a good time to install a new cover with bearing support.
fastblackmerc
03-20-2015, 10:22 AM
Red Locktite for all fasteners.

Might want to have bearings and seals for the rear axles, just in case.
MOTOWN
03-20-2015, 10:23 AM
Here is an ARP kit a few bucks cheaper! http://www.ebay.com/itm/TA-Performance-ARP-Bearing-Cap-Stud-Kit-Fits-Ford-Dana-Rear-Ends-/351333389244?vxp=mtr
fastblackmerc
03-20-2015, 10:42 AM
Here is an ARP kit a few bucks cheaper! http://www.ebay.com/itm/TA-Performance-ARP-Bearing-Cap-Stud-Kit-Fits-Ford-Dana-Rear-Ends-/351333389244?vxp=mtr

Can't go wrong with ARP....
NavySeabee
03-20-2015, 10:52 AM
I'd also replace the bearing cap bolts with studs ... like these:

http://www.ebay.com/itm/8-8-Ford-Dana-60-Main-Cap-Stud-Kit-/131457695427?pt=Motors_Car_Tru ck_Parts_Accessories&hash=item1e9b7d3ec3&vxp=mtr

Also a good time to install a new cover with bearing support.

Unfortunately I did not get the studs. I did get the below cover.

Ford Mustang 8.8 Differential Cover Rear End Girdle System. Also did get the axle bearings & seals :)
MyBlackBeasts
03-20-2015, 10:30 PM
Has anyone used this kit and was told different shims/extra needed to be ordered? It's only 40 bucks but I was under the impression EVERYTHING was included.

http://www.latemodelrestoration.com/item/LRS-4209FRC-K/Mustang-88-410-Ratio-Rear-End-Gear-Kit

3 yellow markings (dots/lines?) were mentioned on the shims he needed.


I am not a fan of the "pak of thin shims" (just examine your concave shims for my reasons). I prefer to do the math & get the 2 single-piece shims needed for the job from Ford. Just my :twocents: