IRS Differential Mounting

[Skuzzy]

I have attached two pics which show what I believe to be the mounting bolts for the IRS differential. One of the bolts is already in. The larger bolts are supposed to be for the front mounting points but are two large in diameter to fit through the mounting ears on the differential. I am pretty sure they are the ones to be used as they did fit through the sleeves in the bushings.

Do I have the correct mounting bolts?

Was I supposed to drill out the mounting ears for the larger bolts? I cannot find any information about that.

I really would hate to have to pull the differential as I am doing this by myself and it is a chore, even with the tools I have (gantry, lift ...).

177818177819

[michael everson]

You do need to drill them out per FFRs instructions. 5/8 diameter.

https://www.factoryfive.com/wp-content/uploads/2019/03/IRS-2015-REV-D.pdf
Mike

[Skuzzy]

You do need to drill them out per FFRs instructions. 5/8 diameter.

https://www.factoryfive.com/wp-content/uploads/2019/03/IRS-2015-REV-D.pdf
Mike

Well crap, look at me making a novice boo-boo. Thank you Mr. Everson. Back to the drawing board.

[Skuzzy]

Okay, so let's try and add something positive. For those of you who have not drilled out the uprights and IRS pumpkin ears, I might suggest you try using a 5/8" tapered reamer. I find it easier to open those holes up with a reamer than a drill bit. Any decent industrial supply shop will have those reamers. If not, you can get them from McMaster-Carr (https://www.mcmaster.com/reamers/round-shank-reamers-for-hole-alignment-7/).

[Namrups]

It's amazing how much torque a battery powered drill has. (corded is worse) Be careful as it will catch and tie you in knots. If you're not prepared for it and do not have a good grip on the drill it will hurt you. Ask me how I know.... :p

[Skuzzy]

It's amazing how much torque a battery powered drill has. (corded is worse) Be careful as it will catch and tie you in knots. If you're not prepared for it and do not have a good grip on the drill it will hurt you. Ask me how I know.... :p

Nice thing about reamers. They are less prone to catching in the hole as long as you use a drop or two of machine oil on them, but you are quite right. Always be ready for that sudden bite to occur. My tactic has always been to hold the drill in such a way that if it does bite it will just rip out of my hand(s).

[Rian_Colorado]

True on all fronts. I'll add that I bought a brand new bit specifically for this - and it helped for sure.

RR