Forward
Control Gear-box ratios.
Well,
now that I own such a beast, I have been looking up info on gear-box
& transfer case ratios for them. The first thing to be aware of is
that there are several changes over the 8 years of production. ( not
including the 101’s at this stage.) Mine is a 1963 which is one of the
first ones. It is a 109inch 2A, suffix a.
The
2A 109inch FC’s were made between 1963 & 66, and had chassis suffix letters a,
b ,c, & d. The 2B 110inch FC’s
(actually 109.5inch) were made between 1967 & 71 and had chassis
suffix letters a, b, c, d,& e
This
one pictured is a 2B with a drop side tray.
The
different ratios for the “Forward Control” follows;
FC
2A
Gear-box suffix a.
(286*****a)
1st
gear ratio 2.996 :1
T/Case Low 3.270
:1
T/Case High 1.300
:1
1st Low = 2.19 mph
@ 1000 rpm
4th High = 16.5 mph @ 1000 rpm
FC
2A
Gear-box suffix b & d.
(286*****b &d) and (300*****b & d) suffix c
not used.
1st
gear ratio
3.609 :1
T/Case
Low 2.920 :1
T/Case High 1.530
:1
1st Low = 2.04 mph
@ 1000 rpm
4th High = 14.1
mph @ 1000 rpm
I wish mine looked this good.
FC 2B
Gear-box suffix a & b.
(325*****a & b) and (330*****a & b)
1st gear ratio 3.609 :1
T/Case Low 3.270
:1
T/Case High 1.530
: 1
This
drawing show the Main and the Sub Chassis of a FC 2B
1st Low = 1.82 mph @ 1000 rpm
4th High =
14.1 mph @ 1000 rpm
The FC’s had the lower transfer case to make up for the 9.00x16
(34inch) tyres fitted. All the diff ratios were 4.7:1 but the 2A Chassis suffix “a”
had Rover diffs in front and back. Later had ENV’s fitted. All the FC
2B’s ENV diffs had a 4inch wider track.
The Series Two “One Ton” also had the “FC” G/box-transfer case (2B ratios I
think), 9.00x16 tyres and other bits fitted.
Compared
this to a standard late 2A “Bonneted Control” L/R with 7.50x16 (31inch) tyres.
1st
gear ratio 3.609 :1
T/Case Low
2.346 :1
T/Case High 1.148 :1
1st Low = 2.30
mph @ 1000 rpm
4th High = 17.1 mph @ 1000 rpm
Leon
Z.
