XRAY - Model racing cars

Hi, the supplied gear diff has 38 teeth giving an internal ratio of 1.9 with a 20 tooth layshaft. For 17.5 blinkey I need 1.7. Is it possibe to get a gear diff housing with 34 teeth? Part no.?

If not how do you 17.5 blinkey racers get the required FDRs? I normally race 13.5 boosted so this is not something I have been concerned with until now.

What FDR do want?I need 4,5:1 in 17,5 Blinky.I run a 76t Spurgear with a 32t pinion with 48dp.
Mike

The T2 009 could run with 34 or 38t diffs so I imagine it is possible but would be a Spec R diff, I have a couple for my wet car bought direct from Spec R that have been good so far

Thanks for the comments guys. I am currently running an FDR of 3.50 which with an IR of 1.77 is 70t spur and a 34 pinion. If I fit the XRAY gear diff and use an IR of 1.9 that would give me a ratio of 3.90. Now I know I can fit a 35 pinion but I think after that the left hand motor mount screw will become inaccessible, so I think 1.9 is out of the question as I guess I would need to add another 4 or 5 teeth to the pinion.

To make matters worse at another track I am thinking of trying 17.5B at the top guys are around 3.1/3.2 FDR.

Clearly the only way to go is smaller spurs but I don't think I want to convert the IR to 1.9! to run a gear diff. And with a spare diff in the toolbox I don't really want to spend money on a Spec-R either!

I thought 17.5B was quite big in the States so I am a bit surprised if XRAY do not provide a smaller rstio with the gear diff