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| | | | Joined: Jun 2003 Posts: 54 Member | | Member Joined: Jun 2003 Posts: 54 | The 61 C20 has the original 4.57:1 rear end. My speedo is not working but it seems to run fairly smooth at around 50-55mph. Any higher and it sounds as if it is straining. Any thoughts on top cruising speed for this setup? Thanks!
Not quite as lean
Not quite as mean, but
Still a Marine!
| | | | | Joined: Mar 2004 Posts: 734 Shop Shark | | Shop Shark Joined: Mar 2004 Posts: 734 | You're probably right about there with an inline. Assuming you have a 1:1 final drive ratio tranny, you're probably taching at 2900-3100 rpm @ 55mph, depending on tire size. I've been pushing my 292 at 60mph since I've owned it but, I don't dig the gas mileage! On the hunt for a T-5 tranny. | | | | | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | On my 52 I swapped in a 4.10 pumpkin and went with 7.50R16 tires, about 31" rolling diameter. 51 on the speedo is 60, turning about 2,500 rpm. Before the swap 4.57 gears with 29" tires 60 mph was 3,000 rpm.
Your 62 should have a wide enough differential to swap out for a newer 14 bolt with 3.73 or 3.42 gears.
Fred
52 3600
69 C-10
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